ECHINODERMATA OF NEW ENGLAND. 31 



III. Calycles not bell-shaped. 



. Calycles conical, long . Campanulina. 



b. Calycles with conical operculum, con- 



stricted at base ; pedicellate. 



Calycella. 



c. Sessile ; not constricted at the base. 



Cuspidella. 



d. Calycles without conical operculnm, 



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. Gonothecse with cleft margin 



and internal marsupium. 



Diphasia. 



b. Orifice of gonotheca, plane ; 



no internal marsupium. 



With verticillate branches. Sertularia. 



Without verticillate branches. 



Antennularia. 



1. With mesial nematophore attached to part 



of calycle. Aglaophenia. 



2. Without mesial nematophore. 



Plumularia. 



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

 thread-like body is found, and Irom the inner base of which it arises. 



