426 Mr. W. Ka Fisher on new 
of flattened, overlapping plates 
(not of elongate, narrow, more or 
less compressed ossicles as in 
Brisinga); these costze 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 ........ Astrocles, Fisher. 
Genus Bristnca, Asbj¢rnsen. 
Brisinga, Asbjprnsen, Fauna Litt. Norvegiz, 1856, andet hefte, p. 95. 
Type, B. endecacnemos, Asbj. 
Admirable figures are given by G. O. Sars in his mono- 
graph of Brisinga coronata (pl. vil.). Brisinga trachydisea 
is the only species of the restricted genus Brisinga that I 
have examined. It was dredged by the steamer ‘ Albatross’ 
in 602 to 772 fathoms in the Philippine Islands. 
Genus CRATEROBRISINGA, Fisher. 
Craterobrisinga, Fisher (subgenus), New East Indian Starfishes, Proc. 
Biological Soc. Washington, vol. xxix. p. 3 (Feb. 24,1916). Type, 
Brisinga panopla, Fisher. 
The species which are to be included in this group are: 
Craterobrisinga panepla (Fisher), C. parallela (Keeler), 
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 35 to 40 irregular, fairly well-spaced, com- 
plete and incomplete prominent, spiniferous coste ; genital 
region equal to about 8°5 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 pedicellariz ; ad- 
ambulacral plates short and broad, with proximally 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 of 
1 or 2 aboral furrow spinelets and 1 tapering suboral spine ; 
first 2 adambulacral plates of each ray fused to those of 
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