598 T0LYCLT1VIX/E. 



Species of Botryllus. 



aureus, Low. and Kolliker. Schlosseri, Pallas. 



bivittatus, Milne-Edw. srnaragdus, Milne-Edw. 



gemmeus, Sav. verrucosus, Daly ell. 



polyclyclus, Sav. violaceus, Milne-Edw; 



Genus BOTRYLLOIDES, Milne-Edwards. 



Stars formed by the systems composing the common mass 

 irregular and ramifying. Individuals placed vertically in 

 linear series ; branchial and anal orifices closely approxi- 

 mated. 



Ex. B. rotifer, Milne-Edwards, pi. 134, fig. 2. Indivi- 

 dual, B. rotifer, fig. 2, a. 



The cloaca, in this genus are prolonged into the common 

 mass as internal, irregular channels, on each side of which 

 the individuals are placed in linear series, instead of having 

 a simple star-like arrangement around the cloaca as in 

 Botryllus. The animals, moreover, have a nearly vertical 

 position, and their orifices are closely approximate. 



Species of Botrijlloides. 



albicans, Milne-Edw. rotifer, Milne-Edw. 



aureus, Sav. ruber, Milne-Edw. 



Leacbii, Sav. 



Sub-fam. POLYCLININ^E. 



Body divided into three distinct portions; a thorax with 

 the branchial apparatus; a superior abdomen with the diges- 

 tive organs ; and a post-abdomen with the heart and repro- 

 ductive organs. 



