FIG. ioi. Bugula avicularia. Two zpoids, magnified, an, anus; az'i'c, avicularia; 

 enib> embryo enclosed in the ooecium; funic, funiculus; gast, muscular bands 

 passing from the stomach to the body-wall; int, intestine; io, mouth; oaec, 

 ooecium ; ces, oesophagus ; ov, ovary '.pit, pharynx ; ret, parieto- vaginal muscles ; 

 sf, spermatidia : stom, stomach. 



182 



