Genera and Species of Brisingidse. 427 



adjacent ray by a non-musculav articulation. R = 200 + 

 mm., 7'= 15 mm. (14 rays) ; R = 245 mm., ?- = 13 mm. 

 (12 rays). 



Type-locaUti/. — ' Albatross ' station 3342, off British 

 Columbia, 52° 39' 30" N., 132° 3«' W., 1588 fathoms, grey 

 ooze, coarse stones, bottom temperature 35°* 3 Fahreniieit. 



Craterohrisitiga synafdoma is characterized by the very 

 long genital region and the numerous, irregular, uiicrowded 

 costse. 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 wliich are referable to this 

 genus — the type, B. mimical Fisiier, 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 papulae close 

 to the margin o£ disk, two corresponding to each ray. 



Beisingella, gen. nov. 



Diagnosis. — As given in foregoing synopsis. 



This genus includes tiie following species : B. fragiUs 

 (Fisher j, type, B. coronata (G. O. iSars), B. exilis (Fislier), 

 B. teneila (Ludwig), and probably also the following species 

 described by Sladen: B. verticillata, B. armillata, B. discincta, 

 and B. memhranacea. B. viediterranea (Perrierj 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 " Hesearches on the Structure and 

 Affinity of the Grenus 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 piisiUa, sp. n. 



Diagnosis. — Rays 10. R = 165 + mm., r = 8 mm., R = 

 20 + ?' ; thickness of disk 2*5 mm.; breadth of ray at base 

 4 mm. Similar in general appearance to B. e,ciUs, Fisher, 



