8 



ZOOLOGY 



SECT. 



branching gelatinous structure, which is beset with numerous 

 short filiform processes, and contains a number of cavities 

 occupied by zooids. The latter (Fig. 670) are not in organic 

 continuity, so that though enclosed in a common investment 







; . ,-,. ':--. .- 



Fio. 670. Cephalodiscus. Entire zooid. (After Mclntosh.) 



they do not form a colony in the sense in which the word is 

 used of the Polyzoa or the Hydroid Zoophytes. They have 

 this feature in common with such a colony that they multiply by 

 the formation of buds : but these become detached before they 



