﻿268 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



spines in a specimen of ChondTocidaris gigantea at hand from the 

 Hawaiian Islands, and I have little hesitation in referring it to that 

 species. It is 37 mm. long and 4 mm. thick without the winglike 

 processes. The wings are in seven rows along the lateral and aboral 

 side of the spine, those of one row alternating with those of the rows 

 on either side. The adoral side of the spine is flattened and is with- 

 out processes. The processes begin 3 mm. from the base. There are 

 tliree or four in each row. Those nearest the base are high conical 

 tubercles. From the base outward they become progressively elon- 

 gated and flattened, the outermost being high thin ridges 4:-6 mm. long 

 with a slightly convex crest. The terminal 7-12 mm. on the spine 

 carries five high thin ridges about 2 mm. high, highest at the proximal 

 end, thence curving downward to the apex. The color is white with 

 streaks and spots of light pink. 



The spine resembles in a general way that from Lau, Fiji, figured by 

 Dr. H. L. Clark under the name of Ghondrocidaris pi'ohlepteryx 

 (Bernice P. Bishop Mus. Bull. 181, p. 314, pi. 41, fig. E, 1945), but the 

 wings are more numerous, are not truncated distally, and are continued 

 downward to the base. 



Genus PHYLLACANTHUS Brandt 



PHYLLACANTHUS IMPERIALIS (Lamarck) 



Cidarites imperialis Lamarck, Histoire naturelle des animaux sans vert^bres, 

 vol. 3, p. 54, 1816 (Red Sea). 



Locality. — Bikini Atoll ; west end of the target area, 3 miles south- 

 west by south of Bikini Island, in the lagoon ; 150 feet ; broken coral 

 bottom; Morrison, August 26, 1947. Four spines, U.S.N.M. No. E. 

 7397. 



Note. — These spines are of the typical form with three narrow 

 evenly spaced white bands; the largest (broken) is 9 mm. in diameter. 



The fact that the detached spines of this species and of Ghondro- 

 cidaris gigantea and Eucidarls metularia were dredged in deep water 

 does not necessarily indicate that the individuals from which these 

 spines came lived at these depths. Although this condition is pos- 

 sible, it is more likely that they lived in shallower water and that 

 after their death the spines were washed into the localities in which 

 they were found. 



Family ARBACIIDAE 

 Genus COELOPLEURUS L. Agassiz 



COELOPLEURUS, sp. 



Locality.— Bi^mi Atoll; 800-900 feet; August 7, 1947. Portion of 

 a spine, U.S.N.M. No. E. 7370. 



