34 



TUNICATA. 



Botryllus (Gaertn.). Mass sessile, encrusting, 

 gelatinous, composed of numerous systems, in 

 which the animals are ranged horizontally in star- 

 like circles around a common vent. Animals with 

 no division of the body into parts ; branchial orifice 

 simple, remote from the vent, 



B. Sclilosseri. B. violaceus. 



polycycliis. Fig. 49 ; 71. s. smaragdus. 



gemmeus. bivittatus. 







48 



49 



50 



Botryllo'ides (M.-Edw.). Eesembling Botrylhis, 

 but the systems forming irregularly-branched or 

 winding lines. Animals placed vertically ; the two 

 orifices near together. 



B. Leachii. 

 albicans. 



B. rotifera. 



rubra. Fig. 50 ; n. s. 



Syntetliys (Forbes). Mass sessile, gelatinous, 

 forming a single system. Animals sessile, having 

 simple orifices without rays. 



S. Hebridicus, Fig. 51 ; \n.s. 



Family II. Clayelinad^. 



Clavelina (Sav.). Animals oblong, erect ; thorax 

 marked with coloured lines. 



C. lepadiformis. Fig. 52 ; 71. s. 

 producta. 

 pumilio ? 



