98 GASTROPODA. 



FAMILY I. ELYSIADJE. 



Without mantle or breathing organs ; body 

 covered with cilia; a single row of tongue-teeth; 

 eyes sessile, on the sides of the head; tentacles 

 simple or wanting. 



Elysia (Eisso). Slug-like, flattened, with lateral 

 expansions ; tentacles simple, in front of the eyes ; 

 foot narrow. 



E. viridis. Fig. 127 ; n. s. 



127 128 129 130 



Actceonia (Quatref.). Head large, distinct, crested 

 at the sides, the crests prolonged behind into two 

 short tentacles, behind which are the eyes ; vent in 

 the middle of the back. 



A. corrugata. Fig. 128 ; mag. 



Cenia (Alder and Hancock). Head slightly 

 angled, carrying two slender tentacles on its back ; 

 eyes behind and outside them ; back elevated. 

 C. Cocksii. Fig. 129 ; mag. 



Limapontia (Johnst.). Leech-like, low in front, 

 rounded and elevated behind ; head distinct, with 



