VELELLADiE. 



53 



90 



91 



Bataria (Escli.). Body circular, 

 with a compressed, elevated, carti- 

 laginous piece within, which has a 

 moveable muscular crest; below 

 concave, with a tubular mouth, 

 surrounded by tentacles in a single 

 marginal row. 



E. pocillum. Fig. 92 ; n. s. 



