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. Schlosseri. 



polycyclus. Fig. 49 ; n. s. 

 gemmeus. 



B. violaceus. 

 smaragdus. 

 bivittatus. 



Botrylloides (M.-Edw.). Resembling Botryllus, 

 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. 



Syntethys (Forbes). Mass sessile, gelatinous, 

 forming a single system. Animals sessile, having 

 simple orifices without rays. 



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



FAMILY II. CLAVELINAD.E. 



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

 marked with coloured lines. 



C. lepadiformis. 

 producta. 

 pumilio ? 



Fig. 52 ; n. s. 



