Genera and Species of Brisingidee. 427 
adjacent ray by a non-muscular articulation. R=200 + 
mm., r=15 mm. (14 rays); R=245 mm., g=13 mm. 
(12 rays). 
Type-locality. — * Albatross’ station 3342, off British 
Columbia, 52° 39’ 30’ N., 132° 38° W., 1588 fathoms, grey 
ooze, coarse stones, bottom temperature 85°3 Fahrenheit. 
Craterobrisinga synaptoma is characterized by the very 
long genital region and the numerous, irregular, uncrowded 
costee. The first two adambulacral plates of each ray are 
joined to the corresponding plates of the adjacent ray, instead 
of only the first plate as in other species of the genus. The 
smaller of the two subambulacral spines at the base of the 
ray has the tip slightly, or sometimes conspicuously, 
thickened and modified. 
BRISINGENES, gen. nov. 
Diagnosis.—As given in foregoing synopsis. 
I know of only two species which are referable to this 
genus—the type, B. mimica, Fisher, from 559 fathoms, 
Buton Strait, Celebes, and B. anchista, sp. n., from the same 
station. In general appearance these species closely resemble 
typical Brisinga, but differ in having a circle of papule close 
to the margin of disk, two corresponding to each ray. 
BRISINGELLA, gen. nov. 
Diagnosis.—As given in foregoing synopsis. 
This genus includes the following species: B. fragilis 
(Fisher), type, B. coronata (G. O. Sars), B. exilis (Fisher), 
B. tenella (Ludwig), and probably also the tollowing species 
described by Sladen: B. verticillata, B. armillata, B. discincta, 
and B. membranacea. B. mediterranea (Perrier) is also very 
probably a member of this genus. Without definite informa- 
tion concerning the gonads it is not possible to be certain. 
In his paper entitled “‘ Researches on the Structure and 
Affinity of the Genus Brisinga, &c.,’’ George Ossian Sars 
describes and beautifully figures the anatomy of Brisingella 
coronata, a typical species of this genus. The special 
differential characters are clearly shown on plates iii., iv., 
and v. 
Brisingella pusilla, sp. n. 
Diagnosis.— Rays 10. R=165 + mm., r=8 mm., R= 
20+r ; thickness of disk 2°5 mm.; breadth of ray at base 
4mm. NSimilar in-general appearance to B. evilis, Fisher, 
