ECHINODERMATA OF NEW ENGLAND. 



17 



the bell. Lips flange-like, extending barely outside the 

 bell-opening. 



/S. apicata. 



Dinematella. Bell ovate, with tall, conical, apical pro- 

 jection in which is found a cavity shaped like the frus- 

 trum of a cone, and which is in free communication with 



that of the proboscis. Tubes four, with jagged edges, 

 broad. Tentacles two, opposite, long, flexible. On the 

 bell-rim between the long tentacles are situated small ten- 

 tacular processes with pigment spots. Proboscis large, 

 swollen at base, light-cream color. 



D. cavosa. 



ESSEX INST. BULLETIN, VOL. XXIII 2 



