! 3° 



SYSTEMATIC ZOOLOGY 



in the body-cavity, except in the Entoprocta, which have no 

 body-cavity. There are no excretory or circulatory organs. A 



avw- 



-avio 



uruc 



Fig. 119. Bugula avicularia. Two individuals or zooids, enlarged, an, anus ; avic, avic- 

 ularia ; emb, embryo inclosed in the ooecium : funic, funiculus ; gast, muscle-bands | 

 ing from stomach to body-wall ; ////.intestine; mo, mouth ; 002c , ooecium ; ass, cesopha. 



, ovary; />//, pharynx; ret, parietal-vaginal muscles; sp, spermatidia; stom, stomach. 

 (After Parker ami Haswell.) 



ganglion lying on the oesophagus, between the mouth and the 

 anus, constitutes the chief portion of the nervous system, and 



