Clark — Neiv Genera of UnstaJked Crinoids. Ill 



loiio;^ at least us Ioiilt as the first, with elongated segments; the cirri are 

 long, compressed, deciduous, the distal segments slightly or not at all 

 shorter than the proximal ; no dorsal spines; opposing spine absent, rarely 

 tVeljly developed. 



Included genera. — Eumetra; TJiysmiometra; Coccometva. 



Bathymetringe sub-fam. nov. 



The second pinnule bears a genital gland and, with the following, is as 

 long as or even much longer than the first; the cirri are short with few 

 segments. 



Included genera. — Bathynwlra; Tliaumatometra. 



The following new genera are well worthy of recognition: 

 Family COMASTERIDyE. 



SCB-FAMILY CAPILLASTERIN.E. 



Neocomatella gi'u. nov. 



Comaiella (part) 1908. A. H. Clark, Smiths. Miscell. Coll. (Quarterly 



Issue), vol. 52, p. 207. 



This is the Atlantic representative of the Pacific genus Comatella from 

 which it differs in its fewer arms and much longer brachials which are 

 triangular and about as long as broad instead of short wedge-shaped or 

 discoidal. NcocomnteJla holds approximately the same relationship to 

 Comatella as Nemaster does to Cafyillasler. 



Genotype. — Antedon alata Pourtales, 1S78. 



Family TROPIOMETRIDiE. . 

 Pterometra gen. nov. 



Plilomeira (part) 1908. A. H. Clakk, Smiths. Miscell. Coll. (Quarterly 



Issue), vol. 52, part 2, p. 224. 



This genus appears to represent the Australian genus Plilometra in the 

 East Indies; it differs markedly from that genus in the regular distribu- 

 tion of the cirri, these being arranged in ten definite columns, and in the 

 nmch more slender pinnules which have longer segments. 



Genotiipe. — Ptilonirtra Irlchojioita A. H. Clark, 1908. 



Family ANTEDONID.E. 



Sub-family ZEXOMETKIN.E. 



Balanometra gen. nov. 



Prrometra. (i)art) 1907. A. H. Clahk, Smiths. Miscell. Coll. (Quarterly 



Issue), vol. 50, p. ;i57. 



The cirri are arranged in ten well-separated and definite columns on a 

 conical centro-dorsal ; the first two pinnules are absent. 



Genotype. — Antedon balanoides P. H. Carpenter, 1888. 



