ECHINODERMATA OF NEW ENGLAND. 



51 



II. Communal and adherent. 



a. In branching colonies 



b. In calcareous encrustations 



III. Not adherent. 



Lives in sand, not colonial. 



Lophohelia. 

 Astra ngia. 



ACTINOLOBA (METRIDIUM). 



a. Tentacles simple, slightly retractile. 



Ilyanthus. 



b. Tentacles in two sets, posterior opening. 



Cereanthus. 



Body covered in sand, colonial. Individuals 



not connected with coenosarc . Edwardsia. 



Parasitic in Cyanea .... Philomedusa. 



A. I. 



Actinoloba. Body fixed. Outer surface smooth. Ten- 

 tacles small, on lobes, retractile, Reproduction; fission, 



