516 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Mouth plates small. Armature consists of a spinelet at outer 

 furrow corner and 2 at the inner, one directed across mouth of 

 furrow and the other, which is near median suture, is directed over 

 actinostome. These spinelets are a little more than half to three- 

 fourths length of plate. The median suture on its outer half is 

 abruptly much wider than on the inner half. (2) There are 2 suboral 

 pointed spines, hea\aly sheathed with pedicellariae, one at either end 

 of the plate, their bases occupying most of the surface of the plate. 

 They are 2 to 2^ times the length of the mouth plates, and they vary 

 somewhat in robustness. The inner is a little the larger. Sometimes 

 the tip is bifid. 



Madreporic body very small and prominent, with a few meander- 

 ing striae. The articular surface of the ambulacral plate, at junc- 

 tion of ray with disk, imusually small, higher than wide, with a very 

 conspicuous suture (broader at the bottom) between the two plates. 



Gonads numerous, serially arranged; interradial pair of adam- 

 bulacral plates and first pair of marginal plates all closely united. 



Type.—CB,t. No. 37024, U.S.N.M. 



Type-locality. — Station 5348, Palawan Passage, 375 fathoms, coral 

 sand, bottom temperature 56.4° F., 2 specimens. 



Distribution. — Known only from vicinity of type-locality. 



Specimens examined. — Besides the types, a fragment of a ray from 

 station 5349, near type-locality, 730 fathoms, coral sand; bottom 

 temperature 40.6° (identification not positive). 



Remarks. — This species closely resembles C. alberti from the Ha- 

 waiian Islands. It differs in having 11 rays which are relatively 

 narrower at the base (9 in alberti) ; longer and thicker proximal 

 subambulacral spines, the inner of the two being nearly as long as 

 the outer on the first 10 or 12 plates, and sometimes also with an 

 expanded tip; relatively longer secondary subambulacral spines 

 throughout ray ; larger suboral spines 2 in number instead of usually 

 3; longer disk spinelets; narrower articulation surfaces of ambu- 

 lacral plates where the ray joins disk. The differences between this 

 and the following species are detailed under C. analoga. 



CRATEROBRISINGA ANALOGA, new species. 



Plate 148, figs. 7, 8 ; plate 149, fig. 1. 



Diagnosis. — Rays 11. Closely related to C. eucoryne^ from which 

 it differs in having more numerous costal ridges, which occupy a 

 little more than the basal half of the ray, these ridges being also 

 more regular, more nearly parallel, and closer together on the swollen 

 portion of the ray; instead of 5 or 6 rudimentary ridges at base of 

 ray, as in cucoryne., there nro only 1 or 2; disk with slightly shorter 

 spinelets. E=:235 mm., r=10 mm. 



