Sentence:  It is not denied there have been bicipitous Serpents with the head at each extream, for an example hereof we finde in Aristotle, and of the like form in Aldrovandus weneet with the Icon of a Lizzard; which double formations do often happen unto <WSD>multiparous</WSD> generations, more especially that of Serpents ... <!--please check this is under correct sense--> 
Meaning of the word marked with <WSD> tags:  Producing several offspring at one time.