88 INVERTEBRATE ZOOLOGY 



animals. These soon die in its grasp, and their disintegrated 

 remains are swept into the mouth by the ciliated tentacles. An 

 ooecium is a disc-like structure which, in some parts of the 

 colony, lies in front of a zocecium. It serves as an egg-capsule 

 in which the embryo develops. A single embryo will be found 

 in each. 



Exercise 3. Find a zocecium with an avicularium attached and 

 draw them. 



Exercise 4. Find a zocecium with an ooecium attached and draw 

 them. 



