ECHINODERMATA OF NEW ENGLAND. 31 



III. Calycles not bell-shaped. 



a. Calycles conical, long . Campanulina. 



b. Calycles with conical operculum, con- 



stricted at base ; pedicellate. 



Calycella. 



c. Sessile ; not constricted at the base. 



Cuspidclla. 



d. Calycles without conical operculum, 



scattered Lafcea. 



B. Calycles adnate, disposed along the stem and 

 branches. 

 I. Without nematophores. 1 



a. Calycles cylindrical and disposed on all 



sides of stem Salacia. 



b. Calycles on creeping stem (not erect). 



Filellum. 



c. Calycles in two series. 



1. Alternate, with operculum. 



Sertularella. 



2. Without operculum. 



a. Gonotheca3 with cleft margin 



and internal marsupium. 



Diphasia. 



b. Orifice of gonotheca, plane ; 



no internal marsupium. 

 W r ith verticillate branches. Sertularia. 



Without verticillate branches. 



Antennularia. 



1. With mesial nematophore attached to part 



of calycle. Aglaophenia. 



2. Without mesial nematophore. 



Plumularia. 



'Small cup-shaped structure resembling small calycles in which a protoplasmic 

 threadlike body is found, and Irom the inner base of which it arises. 



