AGASSIZ AND CLARK: RErORT ON ECHINI. 131 



Station 4968. Between Kobe and Yokohama, Japan, 253 fathoms. 



" 5054. Suruga Gulf, Japan, 282 fathoms. 



" 5055. Suruga Gulf, Japan, 124 fathoms. 



" 5072. Suruga Gulf, Japan, 148-284 fathoms. 

 Fifty-six specimens. 



URECHINIDAE Lambert. (Emended. A. Agassiz.) 



Urechinus naresianus A. Ag. 



Ur echinus naresianus A. Agassiz, 1879. Proc. Amer. Acad., 14, p. 207. 



A series of Urechinus, ranging in length from 30 to 58 mm., does not seem to 

 be distinguishable by any constant character from this cosmopolitan species. 

 Station 4766. Between Atka Island and Bowers Bank, Bering Sea, 1766 

 fathoms. 

 " 5030. 46° 29' 30" N. X 145° 46' E., 1800 fathoms. 

 Thirteen specimens. 



Cystechinus purpureus A. Ag. and Clark. 



Although this species is nearly allied to the southern Wyvillii, it is distinguished 

 from that species by the more compact abactinal system, having only three genital 

 pores, much smaller and wholly inconspicuous pedicels, and the much deeper purple 

 color, which has little or no tendency to red. The genital plates are more or less 

 approximately square, and the distance from the anterior pore to either of the pos- 

 terior ones is not much greater than from one of the latter to the other. The test 

 . is much lower and the individuals are all smaller than the full-grown Wyvillii. 

 Although the tests vary considerably in relative height, the diversity is not so great 

 as is shown in Urechinus naresianus, as figured in the "Challenger" Report 

 (Plate XXX a) by A. Agassiz. The plates near the ambitus are very low, as in 

 Urechinus, with which genus this species is an obvious connecting link. The 

 largest specimen is 66. mm. long and 23 mm. high, while another not quite so long 

 is 33 mm. high. 



Station 4761. 53° 57' 30" N. X 159° 31' W., 1973 fathoms. 



" 4766. Betweeu Atka Island and Bowers Bank, Bering Sea, 1766 



fathoms. 

 " 5030. 46° 29' 30" N. X 145° 46' E., 1800 fathoms. 

 Nine specimens. 



PALAEOPNEUSTIDAE A. Agassiz. 

 Palaeopneustes fragilis de Meu. 



Palaeopneustes fragilis de Meijere, 1903. Tijd. Ned. Dierk. Ver., (2) 8, p. 12. 



All of the specimens are large and badly broken, but there is no doubt of their 

 identity with this East Indian species. 



