ECHINODERMATA OF NEW ENGLAND. 



51 



II. Communal and adherent. 



a. In branching colonics 



b. In calcareous encrustations 



III. Not adherent. 



Lives in sand, not colonial. 



Lophohelia. 

 Astranffia. 





ACTINOLOBA (METRIOIUM). 



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, 



