612 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



spines were dredged at stations 2337, 2338, 2341, 23G0, depth 20-199 

 fathoms (1071G). 



The two specimens from stations 2345 and 2348 are very similar in 

 appearance and of nearly the same size, the smaller measnring 27 mil- 

 limeters in diameter. The spines are long, straight, and tapering, and 

 of a pure white to a light' ftinkish and brownish- white color, with the 

 bases of the delicate brownish-pink described by Mr. Alexander Agassiz. 

 These spines are very finely striated, but appear smooth to the naked 

 eye. 



In the larger specimens from station 2354, which are also both of 

 about the same size (the larger measuring 51 millimeters in diameter) 

 the spines are likewise slender, straight, very long, and gradually taper- 

 ing, being very uniform in their general appearance over most of the 

 two specimens. They are finely fluted, and the still finer striatiou of 

 the surface is also apparent ; the bases are of a rich reddish-brown, 

 much darker than in the smaller specimens. Immediately beyond the 

 base, the shaft becomes of a light green, which gradually changes to a 

 deei) pinkish, the two colors blending for a considerable distance. The 

 pink becomes intensified outwardly generally to within about 10 to 20 

 millimeters of the tip, where it is frequently replaced abruptly by white, 

 especially in the longer spines ; sometimes it continues quite to the tip. 

 The pink also produces a slight banding at times on the outer half of 

 the spines. The longer spines measure from 150 to 155 millimeters in 

 length ; fully three times the diameter of the test. Some of the spines 

 are slightly enlarged and hollowed out at the tip. 



The specimen from station 2415 measures 18 millimeters in diameter. 



Salenia Pattersonii A. Agassiz. 



Stations 2320, 2321, 2322, 2325, 2327, 2334, 2335, 2337, 2342, 2343, 

 2345, 2346, 2349, depth 67-279 fathoms (10649). One small specimen 

 from station 2322, 115 fathoms (10652) had three specimens of a Stylifer 

 attached to the dorsal surface. 



Arbacia puuctulata Gray. 



All of the specimens obtained were young, the majority being quite 

 small ; they were collected at the following localities : Stations 2362, 

 2363, 2365, depth 21-25 fathoms (10655); stations 2369 to 2373, inclu- 

 sive, 25-27 fathoms (10656); stations 2405 to 2409, inclusive, 21-30 fath- 

 oms (10657); stations 2412, 2413, 24-27 fathoms (10658). 



Ccelopleurus floridanus A. Agassiz. 



Station 2316, 50 fathoms (10653) ; stations 2319, 2320, 2322, 2327, 2331, 

 2334, 2335, 2337, 2342, 2347, 2348, depth 67-216 fathoms (10654). 



Diadema setosuin Gray. 



Station 2333, 169 fathoms (10667), two small specimens; station 2363, 

 21 fathoms (10059), several large specimens; station 2405, 30 fathoms 

 (10666), one small specimen ; station 2138 (1884), 23 fathoms (8433), one 

 very young specimen. 



