The testis surrounds the funiculus and may contain visibly mobile spermatozoa. The spherical ovary is attached to the inner wall of the zooecium. Some zooids may contain dark brown spheres, the brown bodies . Some kenozooids may contain brown bodies remaining from the original zooid but, of course, they have no active zooid currently present. Look for brown bodies in the autozooids.
Bryozoans have no special respiratory or excretory organs.
There is no blood vascular system. The nervous system cannot be studied in these preparations. Gymnolaemata Bugula neritina . At the front desk obtain a piece of a living colony of the arborescent, colonial, marine bryozoan Bugula in a dish of seawater. Examine the colony with the dissecting microscope to see the character of the branching.