NO. 5 CLARK : ECHINI OF WARMER EASTERN PACIFIC 343 



34, off La Plata Island, Ecuador. Apparently this Spatangoid occurs 

 throughout the Panamic region, but further material is necessary to estab- 

 lish the limits of its distribution. 



Type.— M.C.Z. no. 7625. 



Type locality. — Hannibal Bank, Panama, 35 fms. 



Depth.— 5-75 fms. 



Specimens examined. — 67 specimens from 19 stations. 



Idiobryssus coelus H. L. Clark 

 Plate 67, Figs. 71-73 



Idiobryssus coelus H. L. Clark, 1939, pp. 173-176, pi. 17. 



The holotype of this odd little Spatangoid is the only specimen at hand. 

 It was taken, together with a smaller paratype, in 40-70 fms, in Darwin 

 Bay, Tower Island, Galapagos Islands, January 16, 1938. It is 12 mm 

 long by 10 mm wide and 4 or 5 mm high. The color in life was white, but 

 the dry specimen is more or less pale brown. The paratype is in the 

 Museum of Comparative Zoolog}', Cambridge. 



Distribution. — Tower Island, Galapagos Islands. 



Holotype. — AHF no. 2. 



Type locality. — Darwin Bay, Tower Island, Galapagos Islands. 



Depth.— 40-70 fms. 



Specimens examined. — The type. 



Brissus latecarinatus (Leske) 

 Plate 67, Fig. 74; Plate 68, Fig. 75 



Spatangus brissus var. latecarinatus Leske, 1778, pp. xx, 185. 



Brissus carinatus Gray, 1825, p. 431. 



Brissus latecarinatus H. L. Clark, 1917, p. 219. 



This widespread Indo-Pacific Spatangoid has long been known from 

 the Panamic region but the Velero has not secured many specimens nor 

 are any of those at hand even half grown. Moreover of the 21 specimens, 

 16 are bare tests, nearly all bleached, and the largest is only 56 x 44 x 30 

 mm. This is almost one-third of the size of the largest recorded 

 specimen, now in the collection of the California Academy of Sciences, 

 which Grant and Hertlein (1938, p. 130) describe as 166 mm long, 128 

 mm wide and 106 mm high. Of the Velero specimens having the spines on 

 and evidently alive when taken, the largest is 39x32x32 mm (Station 

 1079-40). The other Velero specimens, alive when taken, were found at 

 Secas Islands, Panama (Station 446-35) and at Pond Island, Gulf of 

 California (Station 1079-40). The bleached tests at hand, were found 

 along the east shore of Angel de la Guardia Island, March 6, 1936; at 



