Document:

BP (x1-53939) Promissory Note and Guaranty

Exhibit 10.15

PROMISSORY NOTE

FOR VALUE RECEIVED, CBA PROFESSIONAL SERVICES, INC., a Florida corporation (the “Borrower”), promises to pay to the order of JOSEPH R. VICENTE, an individual (the “Lender”), the principal amount of One Hundred Thousand United States of America Dollars (U.S. $100,000.00), together with simple interest on the principal amount of this Convertible Promissory Note (the “Note”) from time to time outstanding at the rate of six percent (6%) per annum.

Interest accrued on the principal amount of this Note from time to time outstanding shall be due and payable on the sixteenth day of each calendar month, commencing on February 16, 2005 and continuing each month thereafter through and including January 16, 2006. The entire principal amount of this Note, together with any and all unpaid interest accrued thereon, shall be finally due and payable on January 16, 2006.

Pre-Payment. The principal amount of this Note and any interest accrued thereon may be prepaid in whole or in part at any time prior to maturity without premium or penalty of any kind. Any amount paid to the Lender or other holder hereof shall be applied first to interest accrued to the date of such payment and then to the principal amount hereof then outstanding.

Events of Default. The occurrence of any one or more of the following events or conditions shall constitute an “Event of Default” under this Note:

(a)

The Borrower shall fail for any reason to make any payment, whether of principal or interest, when due and payable pursuant to the provisions of this Note;

(b)

The Borrower shall fail to observe or to perform any or all of its material agreements, covenants and obligations, or shall otherwise breach, violate or default under, any material agreement, note, mortgage, lease, contract, guaranty or other instrument to which it is a party or by which it or a substantial portion of its properties or assets are bound;

(c)

A final judgment shall be entered against the Borrower which is not satisfied or bonded in full within sixty (60) days after the date of the entry thereof;

(d) 

Any or all of the assets and properties of the Borrower shall be levied upon, seized or attached;

(e)

The Borrower shall (i) admit in writing its inability to pay its debts generally as they become due, (ii) file a voluntary petition under any bankruptcy, insolvency or other law for the relief or aid of debtors, (iii) make any assignment for the benefit of its creditors or (iv) enter into any composition agreement;

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(f)

An involuntary petition shall be filed against the Borrower under any bankruptcy, insolvency or other law for the relief or aid of debtors, which involuntary petition is not dismissed within sixty (60) days after the date of the filing thereof;

(g) 

Any court of competent jurisdiction shall find that the Borrower is insolvent or bankrupt;

(h)

A receiver or trustee shall be appointed for the Borrower or for all or a substantial portion of its assets and properties; or

(i)

The Borrower shall cease to conduct its business, adopt any plan of liquidation, liquidate or dissolve. 

Remedies. Upon the occurrence of any Event of Default, at the option of the Lender or other holder hereof:

(1) 

all amounts outstanding hereunder, whether principal, interest or otherwise, shall become immediately due and payable; 

(2)

simple interest shall accrue on the then outstanding principal amount hereof from the date of any such Event of Default to the date of payment in full of the then outstanding principal amount hereof at the highest rate of interest permitted by the laws of the State of Florida; and

(3)

the Borrower shall pay all reasonable costs and expenses of collection of this Note, including without limitation reasonable attorneys’ fees, costs and expenses, paid or incurred by the Lender or other holder hereof, whether paid or incurred in connection with collection by suit or otherwise.

Waivers. The Borrower and each endorser of this Note severally waives demand, protest, presentment and notice of maturity, non-payment or protest and any and all requirements necessary to hold each of them liable as a maker or endorser hereof.

The waiver by the Lender or other holder of this Promissory Note of the Borrower’s prompt and complete performance of, or default under, any provision of this Promissory Note shall not operate nor be construed as a waiver of any subsequent breach or default and the failure by the Lender or other holder hereof to exercise any right or remedy which it may possess hereunder shall not operate nor be construed as a bar to the exercise of any such right or remedy upon the occurrence of any subsequent breach or default.

Governing Law. This Note shall be governed by, and shall be construed and interpreted in accordance, with the laws of the United States of America and the State of Florida, without giving effect to the principles of conflicts of laws thereof.

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Entire Agreement. This Note constitutes the entire agreement between the Lender and the Borrower with respect to the subject matter hereof and supersedes all prior agreements, understandings, negotiations and arrangements, both oral and written, between the parties with respect to such subject matter. This Note may not be modified, amended, altered or changed unless by a written instrument executed and delivered by the Borrower.

Benefits; Binding Effect. This Note shall be for the benefit of, and shall be binding upon, the parties hereto and their respective successors and assigns.

Jurisdiction and Venue. Any claim or dispute arising out of, connected with, or in any way related to this Note shall be instituted by the complaining party and adjudicated in a court of competent jurisdiction located in Orange County, Florida, and all parties consent to the personal jurisdiction of and venue in such courts. In no event shall any party contest the personal jurisdiction of such courts over or the venue of such courts.

Headings. The headings contained in this Note are for reference purposes only and shall not affect in any way the meaning or interpretation of any or all of the provisions hereof.

IN WITNESS WHEREOF, the Borrower, by and through its undersigned officer thereunto duly authorized, has executed and delivered this Promissory Note as of January 17, 2005.

	 	CBA PROFESSIONAL SERVICES, INC.

	 	 	 
	 	 	 
	 	 	 
	 	 	 
	 	By:

	/s/ MATTHEW L. SCHISSLER

	 	 	Matthew L. Schissler,

	 	 	Chairman and Chief Executive Officer

GUARANTY

In order to induce JOSEPH R. VICENTE, an individual (the “Lender”), to extend credit to CBA PROFESSIONAL SERVICES, INC., a Florida corporation (the “Maker”) and a wholly-owned subsidiary of the undersigned, including that evidenced by the foregoing Promissory Note (the “Note”), the undersigned hereby covenants and agrees with the Lender as follows:

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1.

The undersigned, as joint and several obligor with the Borrower, hereby irrevocably and unconditionally guarantees the payment when due to the Lender of any and all obligations, indebtedness and liabilities of the Borrower to the Lender, whether now existing or hereafter arising, whether absolute or contingent, and whether or not evidenced by a written instrument (collectively, the “Obligations”), including without limitation those evidenced by the Note. This is a guaranty of payment, rather than a guaranty of collection.

2.

If the Borrower shall default in the payment of any or all of the Obligations when due to the Lender, then the undersigned shall pay to the Lender within five (5) days after demand therefor shall have been made, in immediately available funds, the full amount of the Obligations then due (by acceleration or otherwise). Except as otherwise provided in the immediately preceding sentence of this paragraph, the undersigned hereby waives notice of acceptance of this Guaranty and notice of any and all of the Obligations to which it may apply, and hereby waives presentment, demand of payment, protest, notice of dishonor or nonpayment of any and all of the Obligations, suit or the taking of other action by the Lender against, and any other notice to, any party liable thereon (including the undersigned).

3.

The Lender may at any time and from time to time without the consent of, or notice to, the undersigned, without incurring responsibility to the undersigned and without impairing or releasing the obligations of the undersigned hereunder, upon or without any terms or conditions and in whole or in part (i) change the manner, place or terms or payment of, and/or change or extend the time of payment of, renew or alter, any or all of the Obligations, any security there for, or any liability incurred directly or indirectly in respect thereof, and this Guaranty shall apply to all of the Obligations as so changed, extended, renewed or altered; (ii) exercise or refrain from exercising any right against the Borrower or others (including the undersigned) or otherwise act or refrain from acting; (iii) settle or compromise any or all of the Obligations, any security there for or any liability (including any of those hereunder) incurred directly or indirectly in respect thereof or hereof, and may subordinate the payment of all or any part thereof to the payment of any liability (whether due or not) of the Borrower to creditors of the Borrower other than the Lender and the undersigned; (iv) apply any sums by whomsoever paid or howsoever realized, other than payments by the undersigned of any or all of the Obligations, to any liability or liabilities of the Borrower to the Lender regardless of what liability or liabilities of the Borrower remain unpaid; and/or (v) consent to or waive any breach of, or any act, omission or default under, any or all of the Obligations.

4.

No invalidity, irregularity or lack of enforceability of any or all of the Obligations or of any security therefor shall affect, impair or be a defense to this Guaranty, and this Guaranty constitutes a primary obligation of the undersigned.

5.

If and to the extent that the undersigned makes any payment to the Lender or to any other person pursuant to or in respect of this Guaranty, any claim which the undersigned may have against the Borrower by reason thereof shall be subject and subordinate to the prior payment in full of all of the Obligations.

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6.

This Guaranty is a continuing one and all Obligations to which it applies or may apply under the terms hereof shall be conclusively presumed to have been created in reliance hereon. No delay on the part of the Lender in exercising any of its options, powers or rights, or partial or single exercise thereof, shall constitute a waiver thereof. No waiver of any of his rights hereunder, and no modification or amendment of this Guaranty, shall be deemed to be made by the Lender unless the same shall be in writing, duly signed on behalf of the Lender, and each such waiver (if any) shall apply only with respect to the specific instance involved and shall in no way impair the rights of the Lender or the obligations of the undersigned to the Lender in any other respect at any other time. This Guaranty and the rights and obligations of the Lender and of the undersigned hereunder shall be governed by, and construed and interpreted in accordance with, the laws of the State of Florida, without giving effect to the principles of conflicts of laws thereof. This Guaranty is binding upon the undersigned and its successors and assigns and shall inure to the benefit of the Lender and his heirs, personal representatives, successors and assigns, including without limitation any other holder at any time of any or all of the Obligations, including without limitation the foregoing Note.

IN WITNESS WHEREOF, the undersigned, by and through its undersigned officer thereunto duly authorized, has executed and delivered this Guaranty as of January 17, 2005.

	 	CBA PROFESSIONAL SERVICES, INC.

	 	 	 
	 	 	 
	 	 	 
	 	 	 
	 	By:

	/s/ MATTHEW L. SCHISSLER

	 	 	Matthew L. Schissler,

	 	 	Chairman and Chief Executive Officer

5Exhibit 4.1

                                                            BLAKE DAWSON WALDRON

                                                                   LAWYERS

                                                            --------------------

                                  RULES OF THE
                                 PSIVIDA LIMITED
                           EMPLOYEE SHARE OPTION PLAN

<PAGE>

                                    CONTENTS

1.       OBJECT 1

         1.1      Object of Plan                                             1
         1.2      Outline of Plan                                            1

2.       ELIGIBILITY                                                         1

         2.1      Determination of eligibility                               1
         2.2      Relevant considerations                                    1

3.       INVITATIONS                                                         2

         3.1      Invitations                                                2
         3.2      Directors                                                  2
         3.3      Content of invitation                                      2
         3.4      Accompanying documents                                     2
         3.5      Copy of Rules                                              2
         3.6      Price Information                                          3
         3.7      Share Limit                                                3

4.       RENUNCIATION OF INVITATIONS IN FAVOUR OF NOMINEE                    3

5.       APPLICATIONS                                                        3

         5.1      Application                                                3
         5.2      Rules                                                      4
         5.3      Grant and Certificate                                      4

6.       TRANSFER                                                            4

         6.1      No transfer                                                4
         6.2      Death or mental incapacity                                 4
         6.3      Termination of Employment                                  4
         6.4      No additional rights                                       4

7.       EXERCISE                                                            5

         7.1      Exercise                                                   5
         7.2      Other Options                                              5
         7.3      Notice                                                     5
         7.4      Payment                                                    5
         7.5      Issue                                                      5
         7.6      Share issued upon exercise of Option                       5
         7.7      Lapse                                                      6
         7.8      Balance certificate                                        6
         7.9      Listing on ASX                                             6

<PAGE>

8.       ADJUSTMENTS                                                         6

         8.1      Rights/entitlements issues                                 6
         8.2      New issues                                                 6
         8.3      Pro rata bonus issues                                      7
         8.4      Sub-division or consolidation                              7
         8.5      Return of capital                                          7
         8.6      Cancellation of capital that is lost                       7
         8.7      Pro rata cancellation of capital                           7
         8.8      General reorganisation                                     7
         8.9      Cumulative adjustments                                     7
         8.10     Rounding                                                   7
         8.11     Notice of adjustment                                       8
         8.12     Listing Rules                                              8

9.       AMENDMENT OF THE PLAN                                               8

         9.1      Consistency with Trading Rules                             8
         9.2      By the Committee                                           8
         9.3      Hardship                                                   9
         9.4      Listing Rules                                              9

10.      ADMINISTRATION                                                      9

         10.1     Board                                                      9
         10.2     Committee                                                  9
         10.3     Disputes                                                   9

11.      DURATION                                                            9

         11.1     Discretionary                                              9
         11.2     Suspension                                                 9
         11.3     No prejudice                                               10

12.      NOTICES AND CORRESPONDENCE                                          10

         12.1     To the Company                                             10
         12.2     To a Holder or Participant                                 10

13.      GENERAL                                                             10

         13.1     Governing law                                              10
         13.2     No interest in Shares                                      10

14.      INTERPRETATION                                                      10

         14.1     Rules for interpreting this document                       10
         14.2     Business Days                                              11

15.      DEFINITIONS                                                         11

SCHEDULE 1                                                                   15

SCHEDULE 2                                                                   16

SCHEDULE 3                                                                   17

<PAGE>

             RULES OF THE PSIVIDA LIMITED EMPLOYEE SHARE OPTION PLAN

1.    OBJECT

1.1   OBJECT OF PLAN

      The pSivida Limited Employee Share Option Plan is to assist in the
      recruitment, reward, retention and motivation of employees and Officers of
      the Group.

1.2   OUTLINE OF PLAN

      Under this Plan, the Board or Committee may issue to Eligible Persons
      Options to acquire Shares for an Exercise Price and on conditions fixed by
      the Board or Committee on grant of the Options.

2.    ELIGIBILITY

2.1   DETERMINATION OF ELIGIBILITY

      The Committee may from time to time in its absolute discretion decide:

      (a)   whether it is appropriate for an Eligible Person to participate in
            the Plan;

      (b)   (whether or not the Eligible Person is already a Holder) the number
            of Options the Eligible Person is to be invited to apply for at any
            time;

      (c)   the Exercise Conditions (if any), Vesting Period (if any) and
            Exercise Period to apply to the Options the Eligible Person is to be
            invited to apply for; and

      (d)   the Exercise Price for each Option, but the Exercise Price must not
            be less than either:

            (i)   the Minimum Price; or

            (ii)  the Market Price of 1 Share at the date the Committee decides
                  to invite the Eligible Person to apply for the Option.

2.2   RELEVANT CONSIDERATIONS

      In deciding the matters in clause 2.1, the Committee must consider:

      (a)   the Eligible Person's position with the Group and the services
            provided to the Group by the Eligible Person;

      (b)   the Eligible Person's record of employment or service with the
            Group;

      (c)   the Eligible Person's potential contribution to the growth of the
            Group; and

      (d)   any other matters which tend to indicate the Eligible Person's
            merit.

<PAGE>

3.    INVITATIONS

3.1   INVITATIONS

      The Committee may from time to time invite an Eligible Person to apply for
      Options.

3.2   DIRECTORS

      The Committee may only invite a Director, or an associate of a Director
      (within the meaning given by Part 1.2 Division 2 of the Corporations Act
      2001), to apply for an Option as permitted by the Listing Rules.

3.3   CONTENT OF INVITATION

      The Committee must specify in the invitation:

      (a)   the Participant;

      (b)   the number of Options the Participant is invited to apply for;

      (c)   the amount (if any), not exceeding for each Option the lesser of 1
            cent or 1% of the Exercise Price, payable by the Participant (or his
            Permitted Nominee) as consideration for the Options and the payment
            terms including any circumstances in which the Company must refund
            some or all of that amount);

      (d)   for each Option, the Exercise Price, Vesting Period, Option Period
            and any Exercise Conditions;

      (e)   the closing date for applying for each Option;

      (f)   how the Participant is to apply for the Option; and

      (g)   how the Company will during the Option Period, within a reasonable
            time after a request by the Holder, inform the Holder of the current
            market price of Shares.

3.4   ACCOMPANYING DOCUMENTS

      The Committee must include with the invitation described in clause 3.3:

      (a)   a copy, or a summary, of these Rules; and

      (b)   an Acceptance Form.

3.5   COPY OF RULES

      If the invitation is not accompanied by a copy, or a summary, of these
      Rules, the Company must undertake in the invitation that during the Option
      Period, within a reasonable period of the Holder so requesting, the
      Company will provide the Holder without charge with a copy, or a summary,
      of these Rules.

                                       2
<PAGE>

3.6   PRICE INFORMATION

      The Company must undertake in the invitation that during the Option
      Period, within a reasonable period of the Holder so requesting, the
      Company will make available to the Holder the current market price of
      Shares.

3.7   SHARE LIMIT

      The Committee must not invite an application for an Option or grant an
      Option if that would exceed the Share Limit. The Share Limit is exceeded
      if (disregarding any Share or option for a Share offered or issued to a
      person situated at the time of receipt of the offer or invitation outside
      Australia or by way of an offer or invitation which does not need
      disclosure because of section 708 of the Corporations Act 2001) the
      aggregate of the following exceeds 5% of the total number of issued
      Shares:

      (a)   the number of Shares the subject of the Option for which the
            Committee proposes inviting on application, or which the Committee
            proposes to grant;

      (b)   the number of Shares which would be issued if all Options were
            exercised;

      (c)   the number of Shares which would be issued if all other offers or
            invitations or options to acquire unissued Shares pursuant to this
            Plan or any other employee share scheme (as defined in the
            Corporations Act 2001) extended only to employees (including
            directors) of the Company and of any Associated Company were
            accepted or exercised;

      (d)   the number of Shares issued during the previous 5 years pursuant to
            this Plan; and

      (e)   the number of Shares issued during the previous 5 years pursuant to
            any other employee share scheme (as defined in the Corporations Act
            2001) extended only to employees (including directors) of the
            Company and of any Associated Company.

4.    RENUNCIATION OF INVITATIONS IN FAVOUR OF NOMINEE

      Upon receipt of an invitation to apply for Options, a Participant may by
      notice in writing to the Committee nominate a nominee in whose favour the
      Participant wishes to renounce the invitation. The Committee may, in its
      absolute discretion, resolve not to allow such renunciation of the
      invitation in favour of a nominee without giving any reason for such
      decision. If the Committee resolves to allow such renunciation of the
      invitation in favour of a nominee ("PERMITTED NOMINEE") then the Permitted
      Nominee will be issued Options subject to these Rules and the Participant
      must, without limiting any provision in these Rules, ensure that the
      Permitted Nominee complies with these Rules.

5.    APPLICATIONS

5.1   APPLICATION

      A Participant or his Permitted Nominee applying for an Option under an
      invitation made under clause 3 must on or before the closing date stated
      in the invitation (or any later date the Company allows for that
      application only, or for some or all applications):

                                       3
<PAGE>

      (a)   do what is specified in the invitation to apply for the Option; and

      (b)   execute the Acceptance Form, or arrange for the execution of the
            Acceptance Form on its behalf, and deliver it to the Committee.

5.2   RULES

      By accepting the invitation to apply for the Option, the Participant or,
      if applicable, his Permitted Nominee, agrees to be bound by this Plan.

5.3   GRANT AND CERTIFICATE

      Upon receipt of a duly completed Acceptance Form, the Company must:

      (a)   grant the Option to the Participant or his Permitted Nominee; and

      (b)   issue the Holder an Option Certificate for the Option.

6.    TRANSFER

6.1   NO TRANSFER

      Each Option is personal to the Holder and is not transferable,
      transmissible, assignable or chargeable, except in accordance with clause
      6.2 or clause 6.3, or with the prior written consent of the Committee.

6.2   DEATH OR MENTAL INCAPACITY

      With the written approval of the Committee which it may give or withhold
      in its absolute discretion, an Option may (but only at a time permitted by
      the approval and in accordance with any conditions specified in the
      approval) be exercised by the legal personal representatives of a Holder
      who dies before the end of the Option Period or whose estate becomes
      liable before the end of the Option Period to be dealt with under the laws
      relating to mental health.

6.3   TERMINATION OF EMPLOYMENT

      If the Participant ceases to be an Eligible Person at any time after the
      Vesting Period and before the end of the Option Period, the Committee may
      in its absolute discretion (on any conditions which it thinks fit) decide
      that the Option held by that Participant (or, where applicable, his
      Permitted Nominee) does not lapse under clause 7.7(d) but lapses instead
      at the time and on the conditions it specifies by notice to the Holder. In
      making a decision under this clause, the Committee may consider any
      relevant matter (for example, whether the Participant ceased to be an
      Eligible Person by reason of retirement, ill-health, accident or
      redundancy).

6.4   NO ADDITIONAL RIGHTS

      The Plan does not give any person any additional rights to compensation or
      damages as a result of the termination of employment or appointment.

                                       4
<PAGE>

7.    EXERCISE

7.1   EXERCISE

      The Holder may exercise an Option only:

      (a)   during an Exercise Period;

      (b)   by doing during that Exercise Period everything required by clause
            7.3; and

      (c)   by at the same time either:

            (i)   exercising all the Options which the Holder is then entitled
                  to exercise; or

            (ii)  exercising a number of Options such that the Company will
                  issue a minimum number of Shares that the Committee has
                  determined, or a multiple of that number.

7.2   OTHER OPTIONS

      The exercise of an Option does not prevent the exercise of any other
      Option.

7.3   NOTICE

      To exercise an Option, the Holder must give to the Company a notice
      specifying that it exercises the Option accompanied by:

      (a)   the Option Certificate; and

      (b)   payment of the full amount of the Exercise Price by cheque made out
            in favour of the Company.

7.4   PAYMENT

      Exercise of an Option is only effective when the Company receives full
      value for the full amount of the Exercise Price in cleared funds.

7.5   ISSUE

      Not more than 10 Business Days after the exercise of an Option becomes
      effective, the Company must issue to the Holder the Share the subject of
      the Option.

7.6   SHARE ISSUED UPON EXERCISE OF OPTION

      The Share issued on exercise of an Option:

      (a)   is subject to the constitution of the Company; and

      (b)   ranks equally in every way (including for dividends for which
            entitlement is determined after the issue) with those then issued
            fully paid Shares whose holders are entitled to participate in full
            in any dividend.

                                       5
<PAGE>

7.7   LAPSE

      Each Option lapses:

      (a)   on exercise of the Option under clause 7.3;

      (b)   if the Option has not been exercised at the end of the Option
            Period;

      (c)   subject to clause 6.2, if the Participant ceases to be an Eligible
            Person during the Vesting Period;

      (d)   subject to clauses 6.2 and 6.3, if the Participant ceases to be an
            Eligible Person after the Vesting Period and the Participant or, if
            appropriate, his Permitted Nominee, does not exercise the Option
            within 30 Business Days after that happens;

      (e)   if the Committee becomes aware of circumstances which, in the
            reasonable opinion of the Committee indicate that the Participant
            has acted fraudulently, dishonestly or in a manner which is in
            breach of his or her obligations to the Company or any Associated
            Company and the Committee (in its absolute discretion) determines
            that the Option held by the Participant or, where appropriate, his
            Permitted Nominee lapses; or

      (f)   if the Company commences to be wound up.

7.8   BALANCE CERTIFICATE

      If the Holder exercises less than all of the Options in an Option
      Certificate, the Committee must issue to the Holder an Option Certificate
      for the remaining Options.

7.9   LISTING ON ASX

      When the Option is exercised, the Company must apply to ASX (and any other
      stock exchange on which the Shares are quoted) for, and will use its best
      endeavours to obtain, quotation for the Share to be issued to the Holder
      on exercise of the Option.

8.    ADJUSTMENTS

8.1   RIGHTS/ENTITLEMENTS ISSUES

      If after the Vesting Period but during the Option Period of an Option, the
      Company makes a pro rata offer or invitation to holders of Shares or other
      securities of the Company or any other entity, the Company must give the
      Holder notice not less than 9 Business Days before the Record Date to
      determine entitlements to receive that offer or invitation to enable the
      Holder to exercise the Option and receive that offer or invitation in
      respect of the Share issued on exercise of the Option.

8.2   NEW ISSUES

      If after the Vesting Period and before the end of the Option Period the
      Company gives holders of Shares the right (pro rata with existing
      shareholdings) to subscribe for additional securities and the Option is
      not exercised in time to enable the Holder to obtain the Share issued on
      exercise of the Option with the right to subscribe for additional
      securities, the Exercise Price of an Option after the issue of those
      securities is adjusted in accordance with the formula set out in schedule
      2.

                                       6
<PAGE>

8.3   PRO RATA BONUS ISSUES

      If during the Option Period the Company makes a pro rata bonus issue to
      holders of Shares and an Option is not exercised before the Record Date to
      determine entitlements to that bonus issue, the number of securities to be
      issued on exercise of the Option is the number of Shares before that bonus
      issue plus the number of securities which would have been issued to the
      Holder if the Option had been exercised before that Record Date.

8.4   SUB-DIVISION OR CONSOLIDATION

      If during the Option Period the Company subdivides or consolidates its
      Shares, the Options must be subdivided or consolidated (as the case may
      be) in the same ratio as the Shares and the Exercise Price must be amended
      in inverse proportion to that ratio.

8.5   RETURN OF CAPITAL

      If during the Option Period the Company makes a return of capital, the
      number of Options remains the same, and the Exercise Price of each Option
      is reduced by the same amount as the amount returned in relation to each
      Share.

8.6   CANCELLATION OF CAPITAL THAT IS LOST

      If during the Option Period the Company makes a cancellation of any paid
      up share capital that is lost or not represented by available assets, the
      number of Options and the Exercise Price of each Option is unaltered.

8.7   PRO RATA CANCELLATION OF CAPITAL

      If during the Option Period the Company reduces its issued share capital
      on a pro rata basis, the number of Options must be reduced in the same
      ratio as the Shares and the Exercise Price of each Option must be amended
      in inverse proportion to that ratio.

8.8   GENERAL REORGANISATION

      If during the Option Period the Company reorganises its issued share
      capital in any way not contemplated by this clause 7, the number of
      Options or the Exercise Price, or both, must be reorganised so that the
      Holder will not receive a benefit that holders of Shares do not receive.

8.9   CUMULATIVE ADJUSTMENTS

      Each adjustment under clauses 8.1 to 8.8 must be made for every
      unexercised Option every time the relevant clause applies during the
      Option Period.

8.10  ROUNDING

      Until an Option is to be exercised, all calculations adjusting the number
      of Shares or the Exercise Price must be carried out to include all
      fractions, but on exercise the number of Shares issued is rounded down to
      the next lower whole number and the Exercise Price rounded up to the next
      higher cent.

                                       7
<PAGE>

8.11  NOTICE OF ADJUSTMENT

      The Company must give notice to Holders of any adjustment to the number,
      description or items of security which are to be issued on exercise of an
      Option or to the Exercise Price, and must do so in accordance with any
      applicable Listing Rules. This notice may be in the form of a revised
      Option Certificate.

8.12  LISTING RULES

      An adjustment must not be made under this clause 8 unless it is consistent
      with the Listing Rules. The Company may amend the terms of any Option, or
      the rights of any Holder under this Plan, to comply with the Listing Rules
      applying at the time to any reorganisation of capital of the Company.

9.    AMENDMENT OF THE PLAN 9.1 CONSISTENCY WITH TRADING RULES

      If the Company is either (or both) admitted to the Official List of the
      ASX or a member of CHESS, the following provisions apply (unless the ASX
      or the SCH waives the relevant Trading Rule in writing).

      (a)   Despite anything contained in this Plan, if the Trading Rules
            prohibit an act being done, the act must not be done.

      (b)   Nothing in this Plan prevents an act being done that the Trading
            Rules require to be done.

      (c)   If the Trading Rules require an act to be done or not to be done,
            authority is given for that act to be done or not to be done (as the
            case may be).

      (d)   If the Trading Rules require this Plan or the terms of the issue of
            the Options to contain a provision and they do not contain such a
            provision, this Plan or the terms of issue of the Options (as the
            case may be) are taken to contain that provision.

      (e)   If the Trading Rules require this Plan or the terms of the issue of
            the Options not to contain a provision and they contain such a
            provision, this Plan or the terms of issue of the Options (as the
            case may be)are taken not to contain that provision.

      (f)   If any provision of this Plan or the terms of the issue of the
            Options are or become inconsistent with the Trading Rules, this Plan
            or the terms of issue of the Options (as the case may be) are taken
            not to contain that provision to the extent of the inconsistency.

                                       8
<PAGE>

9.2   BY THE COMMITTEE

      Subject to clause 9.4, the Committee may by resolution:

      (a)   amend this Plan or all or any of the rights or obligations of the
            Participants or Holders; and

      (b)   formulate (and subsequently amend) special terms and conditions, in
            addition to those set out in this Plan, to apply to Participants or
            Holders who are employed in, resident in, or citizens of, a
            particular jurisdiction.

9.3   HARDSHIP

      The Committee may, if it reasonably forms the opinion that the operation
      of any term of an Option or of this Plan is or may be unfair, harsh or
      unconscionable for any Participant or Holder in the circumstances relating
      to that Participant or Holder, alter, amend or vary that term or its
      operation by notice in writing to the affected Participant or Holder.

9.4   LISTING RULES

      The Committee must comply with any restrictions or procedural requirements
      under the Listing Rules for amending an employee incentive scheme or for
      amending the terms of issued options, unless those restrictions or
      requirements are expressly or impliedly relaxed or waived by the ASX or
      any of its delegates generally, or in a particular case or class of cases.

10.   ADMINISTRATION

10.1  BOARD

      The Board may manage and administer the Plan for the Company and has all
      powers necessary to do so.

10.2  COMMITTEE

      The Board may delegate management and administration of the Plan to a
      committee of the Board formed under the constitution of the Company. The
      Board may direct the Committee how to exercise any of its discretions
      under these Rules or the Plan and the Committee must comply with any
      direction of the Board.

10.3  DISPUTES

      Any dispute or difference of any nature arising in relation to the Plan
      must be referred to the Committee. The Committee's decision on that
      dispute or difference is final and binding on the Company, the
      Participants and the Holders in all respects.

11.   DURATION

11.1  DISCRETIONARY

      The Plan continues in operation until the Committee decides to end it.

11.2  SUSPENSION

      The Committee may suspend the operation of the Plan for a fixed period or
      indefinitely, and may end any suspension.

                                       9
<PAGE>

11.3  NO PREJUDICE

      If the Plan ends or is suspended for any reason, that does not prejudice
      the accrued rights of Holders or Eligible Persons (or their Permitted
      Nominees).

12.   NOTICES AND CORRESPONDENCE

12.1  TO THE COMPANY

      Any notice given by or correspondence from a Holder or Participant to the
      Company or the Committee in connection with the Plan is only effective if
      it is in writing, signed and given at or sent to the principal place of
      business of the Company, or any other address of which the Company gives
      notice.

12.2  TO A HOLDER OR PARTICIPANT

      Any notice given by or correspondence from the Company or the Committee to
      a Holder or Participant in connection with the Plan must be in writing and
      must be given or made by a person authorised by the Committee on behalf of
      the Company or the Committee to the place of employment of the Holder or
      Participant or to the last address of that person given to the Company.

13.   GENERAL

13.1  GOVERNING LAW

      (a)   This Plan is governed by the law in force in Western Australia.

      (b)   The Company and each Holder and Participant submit to the
            non-exclusive jurisdiction of the courts exercising jurisdiction in
            Western Australia and any court that may hear appeals from any of
            those courts, for any proceedings in connection with this Plan, and
            waive any right they might have to claim that those courts are an
            inconvenient forum.

13.2  NO INTEREST IN SHARES

      A Holder has no interest in a Share the subject of an Option unless and
      until that Share is issued to the Holder on exercise of the Option.

14.   INTERPRETATION

14.1  RULES FOR INTERPRETING THIS DOCUMENT

      Headings are for convenience only, and do not affect interpretation. The
      following rules also apply in interpreting this document, except where the
      context makes it clear that a rule is not intended to apply.

      (a)   A reference to:

            (i)   legislation (including subordinate legislation) is to that
                  legislation as amended, re-enacted or replaced, and includes
                  any subordinate legislation issued under it;

                                       10
<PAGE>

            (ii)  a document or agreement, or a provision of a document or
                  agreement, is to that document, agreement or provision as
                  amended, supplemented, replaced or novated;

            (iii) a party to this document or to any other document or agreement
                  includes a permitted substitute or a permitted assign of that
                  party;

            (iv)  a person includes any type of entity or body of persons,
                  whether or not it is incorporated or has a separate legal
                  identity, and any executor, administrator or successor in law
                  of the person; and

            (v)   anything (including a right, obligation or concept) includes
                  each part of it.

      (b)   A singular word includes the plural, and vice versa.

      (c)   A word which suggests one gender includes the other genders.

      (d)   If a word is defined, another part of speech has a corresponding
            meaning.

      (e)   If an example is given of anything (including a right, obligation or
            concept), such as by saying it includes something else, the example
            does not limit the scope of that thing.

      (f)   A reference to "DOLLARS" or "$" is to Australian currency.

      (g)   The words "SUBSIDIARY", "HOLDING COMPANY" and "RELATED BODY
            CORPORATE" have the same meanings as in the Corporations Act 2001.

14.2  BUSINESS DAYS

      If the day on or by which a person must do something under this document
      is not a Business Day:

      (a)   if the act involves a payment that is due on demand, the person must
            do it on or by the next Business Day; and

      (b)   in any other case, the person must do it on or by the previous
            Business Day.

15.   DEFINITIONS

      In these Rules, the following definitions apply.

      "ACCEPTANCE FORM" means the form for the acceptance of an invitation to
      apply for Options as set out in schedule 1 or in such other form as
      approved by the Committee from time to time.

      "ASSOCIATED COMPANY" means:

      (a)   any company that is a related body corporate of the Company; or

      (b)   any company in which the Company has 20% or more of the Voting
            Power.

                                       11
<PAGE>

      "ASX" means Australian Stock Exchange Limited.

      "BID PERIOD" has the same meaning as in section 9 of the Corporations Act
      2001.

      "BOARD" means the board of Directors of the Company.

      "BUSINESS DAY" means a "business day" under the Listing Rules.

      "CHANGE IN CONTROL" means:

      (a)   a person's Voting Power in the Company increases from less than 30%
            to 30% or more; or

      (b)   a person's Voting Power in the Company decreases from 30% or more to
            less than 30%; or

      (c)   the Board resolving that it considers that a person who previously
            had not been in a position to do so, is in the position, directly or
            indirectly, and either alone or with associates, to remove one-half
            or more of the Directors.

      "CHANGE IN CONTROL PERIOD" means, in relation to a Change in Control, the
      20 Business Days after the day on which the Change in Control occurred.

      "CHESS" means the Clearing House Electronic Subregister System operated by
      ASX Settlement and Transfer Corporation Pty Limited.

      "COMMITTEE" means the Board or, if the Board delegates to a committee
      under clause 10.2, that committee.

      "COMPANY" means pSivida Limited ABN 78 009 232 026.

      "DIRECTOR" means a director of the Company.

      "ELIGIBLE PERSON" means any:

      (a)   Officer; or

      (b)   person employed (full time or part time) by the Company or by
            Associated Company.

      "EXERCISE CONDITION" means, for an Option, a condition which must be met
      before the Option can be exercised.

      "EXERCISE PERIOD" means, for an Option, each of:

      (a)   each day after the Vesting Period and before the end of the Option
            Period;

      (b)   each Bid Period during the Option Period regardless of whether the
            Exercise Conditions (if any) applicable to that Option have been
            satisfied or not at the commencement of each Bid Period; and

      (c)   each Change in Control Period during the Option Period.

                                       12
<PAGE>

      "EXERCISE PRICE" means the subscription price on exercise of an Option
      fixed for that Option under clause 3 (as adjusted under clause 8).

      "GROUP" means the Company and all Associated Companies.

      "HOLDER" means, in relation to an Option, the person (whether a
      Participant or a Permitted Nominee) registered as the holder of the Option
      in the Company's register of option holders.

      "LISTING RULES" means the listing rules of ASX as they apply to the
      Company from time to time.

      "MARKET PRICE" of a Share, at a particular date, means the price
      determined by the Committee to be the weighted average closing price of
      Shares sold on ASX on the 5 trading days immediately preceding that date
      (but if no Shares were sold on ASX during that 5 day period the Market
      Price of a Share is to be the amount determined by the Committee to be
      equal to the closing price of Shares sold on ASX on the last trading day
      on which Shares were traded).

      "MINIMUM PRICE" means the amount prescribed by the Listing Rules as the
      minimum price for options (if any).

      "OFFICER" means any director (including a non-executive director) or
      company secretary of the Company or of an Associated Company.

      "OPTION" means an option to subscribe under this Plan for 1 fully paid
      Share (as adjusted under clause 8).

      "OPTION CERTIFICATE" means the certificate issued by the Company to a
      Holder for an Option, such certificate to be substantially in the form set
      out in schedule 3, or in such other form as the Board may decide from time
      to time.

      "OPTION PERIOD" means, for an Option, the period starting on the date on
      which the Company grants the Option and ending on the date specified in
      the invitation to apply for that Option.

      "PARTICIPANT" means any Eligible Person who the Committee has decided to
      invite to apply for Options under the Plan.

      "PERMITTED NOMINEES" is defined in clause 4.

      "PLAN" means these Rules and the pSivida Limited Employee Share Option
      Plan established in accordance with this document.

      "RECORD DATE" has the meaning given by the Listing Rules.

      "RULES" means the rules of the pSivida Limited Employee Share Option Plan
      established in accordance with this document.

      "SCH" means the body corporate acting as the securities clearing house
      under the Corporations Act 2001.

                                       13
<PAGE>

      "SHARE" means an ordinary share in the Company.

      "TRADING RULES" means the Listing Rules, any other rules of the ASX
      applying to the Company while it is admitted to the official list of the
      ASX, and the SCH business rules as amended or replaced from time to time.

      "VESTING PERIOD" means, for an Option, the period of 1 year after the date
      of grant or another period fixed by the Committee (for all Options or for
      particular Options).

      "VOTING POWER" has the same meaning as in section 610 of the Corporations
      Act 2001.

                                       14
<PAGE>

                                   SCHEDULE 1

To:   pSivida Limited
      Level 25
      QV1 Building
      250 St George's Terrace
      PERTH  WA  6000

      Attention: The Company Secretary

1.    ACCEPTANCE*

      I, _____________________________ of ___________________________, accept
      the Company's Offer to me dated _________________ to apply for
      _________________ pursuant to the pSivida Limited Employee Share Option
      Plan [and enclose a cheque in the amount of $________________ in full
      payment of the issue price for those Options].

2.    RENUNCIATION IN FAVOUR OF PERMITTE NOMINEE*

      I, ____________________ of ______________________________ , wish to
      renounce the Company's Offer to me dated ___________________ to apply for
      __________________ Options pursuant to the pSivida Limited Employee Share
      Option Plan in favour of my nominee, ______________________ of
      _____________________________. [My Nominee encloses a cheque in the amount
      of $_________________ in full payment of the issue price for those
      Options].

      I agree to procure that my Nominee will comply with the rules of the
      pSivida Limited Employee Share Option Plan.

      Date:

      ----------------------------
      Signature of Offeree

      ----------------------------
      Name of Offeree

      *     Complete whichever section is applicable

                                       15
<PAGE>

                                   SCHEDULE 2

         01 = 0 - E [P - (S + D)]
                    -----------------------------------------
                          N + 1

         where:

         01 =     The new Exercise Price of the Option.

         0  =     The old Exercise Price of the Option.

         E  =     The number of Shares into which an Option is exercisable.

         P  =     The average closing price (excluding special crossings,
                  overnight sales and exchange traded option exercises) on the
                  Stock Exchange Automated Trading System provided for the
                  trading of securities on ASX of Shares (weighted by reference
                  to volume) during the 5 trading days before the ex rights date
                  or ex entitlements date.

         S  =     The subscription price for one security under the renounceable
                  rights or entitlements issue.

         D  =     The dividend due but not yet paid on existing Shares (except
                  those to be issued under the renounceable rights issue or
                  entitlements issue).

         N  =     Number of Shares with rights or entitlements required to be
                  held to receive a right to one new security.

         However, if 01 under this formula is less than the Minimum Price, the
         new Exercise Price of the Option is to be equal to the Minimum Price.

                                       16
<PAGE>

                                   SCHEDULE 3

================================================================================

--------------------------------------------------------------------------------

                                 PSIVIDA LIMITED
                               ABN: 78 009 232 026
                        (registered in Western Australia)

--------------------------------------------------------------------------------

                               OPTION CERTIFICATE

[NAME OF OPTIONHOLDER)                Register              Certificate Number
INCLUDING ABN IF A COMPANY]
                                    -------------------    ---------------------
[ADDRESS OF OPTIONHOLDER]
                                    -------------------    ---------------------

                                        Option Numbers              Issue Date

                                    -------------------    ---------------------

                                    -------------------    ---------------------

--------------------------------------------------------------------------------

is the registered holder of:

[NUMBER OF OPTIONS]

options over unissued shares in pSivida Limited issued on the terms contained in
the Rules of the pSivida Limited Employee Share Option Plan dated [ ].

NOTE: This certificate must be surrendered on the exercise of any of the
options.

EXECUTED by PSIVIDA LIMITED:

------------------------------------          ----------------------------------
Signature of director                         Signature of director/secretary

------------------------------------          ----------------------------------
Name of director                              Name of director/secretary

--------------------------------------------------------------------------------

================================================================================

                                       17
<PAGE>

                                 EXERCISE NOTICE

               FOR OPTIONS OVER UNISSUED SHARES IN PSIVIDA LIMITED

[NAME OF OPTION HOLDER INCLUDING ABN IF A COMPANY], of

.................................................................................
                                    (ADDRESS)

hereby gives notice to pSivida Limited that it exercises

.................................................................................
(NUMBER OF OPTIONS - MUST BE THE ENTIRE HOLDING OR A MULTIPLE OF 1 000 OPTIONS)

options over unissued shares in pSivida Limited, from the registered holding set
out on the front side of this certificate.

 DATED:

 SIGNED:

 ..................................................
 Name

 A. FOR USE BY COMPANIES HAVING A COMMON SEAL

 THE COMMON SEAL of the fixing of which was witnessed by:

 --------------------------------         -------------------------------------
 Signature of director/secretary*         Signature of director/sole director*

 --------------------------------         -------------------------------------
 Name                                     Name

B. FOR USE BY COMPANIES NOT HAVING A COMMON SEAL

 EXECUTED by:

 --------------------------------         -------------------------------------
 Signature of director/secretary*         Signature of director/sole director*

 --------------------------------         -------------------------------------
 Name                                     Name

* Delete whichever is not applicable

                                       18

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