1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 611 



2327, 2330, 2334, 2349, deptli 33-182 fathoms (10GG2). The young spe- 

 cimeus collected at station 2138, depth 23 tathoms, 1884 (7479), aud re- 

 ferred in the last report to Cidaris tribuloides, belong to this species. 



The three larger specimens mentioned above came up in excellent 

 condition, with most of the spines intact. The smallest of the three, 

 from station 2335, measured 28 millimeters in diameter ; the largest^ 

 from station 2326, measured 68 millimeters in diameter; height, 50 

 millimeters; actinostome, 24 millimeters; apical system, 26 millime- 

 ters; length of longest radiole, 78 millimeters; 9-10 primary interam- 

 bulacral plates. The spines in all of these specimens exhibited every 

 gradation in structure from the nearly smooth variety to those which 

 are strongly spiny, the latter greatly predominating. In one of the 

 specimens the genital plates are in contact at their inner ends, but ia 

 the others the ocular ])lates touch the anal. 



Dorocidaris papillata A. Agassiz. 



Typical specimens, mostly of small size, were obtained from the fol- 

 lowing localities: Stations 2319-2322, 2324, 2327, 2336, 2337, 2342, 

 2345, 2346, 2347, 2348, and 2349, depth 33 to 230 fathoms (10710) ; sta- 

 tion 2323, 163 fathoms (10709); station 2341, 143 fathoms (10708); sta- 

 tion 2415, 440 fathoms (10756). 



A variety of this species, with slender, strongly serrated sijines^ 

 described by Mr. Alexander Agassiz in his " Eevision of the Echini,''' 

 pages 256-257, was collected in very large numbers at each of the four 

 following stations: 2316, 2317, 50 fathoms (10051); 2318, 45 fathoms 

 (10052, 10712); 2418, 90 fathoms (10053). A few specimens of the same 

 were also obtained at station 2334, 67 fathoms (10713) ; 2351, 426 fath- 

 oms (10711); 2372, 2373, 25-27 fathoms (10715); 2420, 104 fathoms 

 (10714). 



Of this variety the larger specimens measure about 32 millimeters in 

 diameter, and all have long, very slender, tapering spines, equalling' iii 

 length from one and one-half to three times the diameter of the test, 

 the spines being usually proportionally longer in the smaller specimens. 

 The general color of the test in alcoholic si^ecimens is a pale yellowish^ 

 greenish, or buff; the secondary spines have each a broad band of dark 

 pink through tlie center, which sometimes covers nearly the entire 

 width of the spines. The primary spines in young specimens are gen- 

 erally greenish, and in the larger ones are grayish with a tinge of 

 green ; they are frequently banded. The abactinal system is violet or 

 violet brown, the color varying much in intensity, the ocular plates be- 

 ing lighter tbaii the others. 



Porocidaris Sliarreri A. Agassiz. 



Two large specimens were obtained from station 2354, 130 fathoms 

 (10717) ; aud one medium-sized specimen came from each of the three 

 following localities: Station 2345, 184 fathoms (10706); station 2348, 

 211 fathoms (10705); station 2415, 440 fathoms (10704). Fragments of 



