426 Mv. W. K. Fishev on new 



of flattened, overlappiug plates 

 (not of elongate, narrow, more or 

 less compressed ossicles as in 

 Brisiiu/it) ; these costae bear spine- 

 lets and are separated by intervals 

 devoid of plates ; furrow spine- 

 lets with curiously modified ex- 

 panded tips. Genotype, Astro- 

 cles actinodetus, Fisher Asfroeles, Fisher. 



Genus Bristnga, Asbj^insen. 



BrisiJiga. Asbj^rnsen, Fauna Litt. Norvegite, 1850, andet hefte, p. 95. 

 Type, B. etidecacnemos, Asbj. 



Admirable figures are given by G. O. Sars in his mono- 

 graph of Brisinga coronata (pi. viii.). Bristnga trachydisca 

 is the only species of the restricted genus Brisinga that I 

 have examined. It was dredged by the steamer ' Albatross' 

 in 602 to 772 fatlioius in the Philippine Islands. 



Genus Craterobrisinga, Fislier. 



Craterohrisinga, Fisher (subgenus), New East Indian Starfishes, Proc. 

 Biological Soc. Washington, vol. xxix. p. 33 (Feb. 24, 1916). Type, 

 Brisinya panopla, Fisher. 



The species which are to be included in this group are : 

 Craterobrisinga panopla (Fisher), C. parallela (Koehler), 

 C. alberti (Fisher), C. cricophora (Sladen), C. eucoryne 

 (Fisher), C. variispina (Ludwig), C. multicostata (Verrill), 

 C. evermanni (Fisher), aberrant. 



Craterobrisinga synaptoma, sp. n. 



Diagnosis. — Rays 12, 14, and 15, with very long genital 

 area crossed by o5 to 40 irregular, fairly well-spaced, com- 

 plete and incomplete prominent, spiniferous costa? ; genital 

 region equal to about 8"0 to 10 7', or '6 total length of ray ; 

 disk with prominent spinelets, solitary except on primary 

 radial plates, about 1 mm. long; no disk pedicellariie ; ad- 

 ambulacral plates short and broad, with proximaily usually 

 2 aboral furrow spinelets and 2 subambulacral spines all in a 

 transverse series, and sometimes also a furrow spinelet on the 

 proximal half of plate ; first 10 or 12 outer subambulacral 

 spines with circular, enlarged, sharply truncate tip; mouth- 

 plates decidedly small, with 2 or 3 actinostomial spinelets, 

 and on the outer part of plate a transverse series consisting ot 

 1 or 2 aboral furrow spinelets and I tapering suboral spine ; 

 first 2 adambulacral plates of each ray fused to those ot 



