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. 

 Astrangia. 



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 ccenosarc . Edwardsia. 



Parasitic in Cyanea . . ' . . Philomedusa. 



A. I. 



Actinoloba. Body fixed. Outer surface smooth. Ten- 

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



