ASTEEOIDEA OF H.M.S. ' CHALLENGEE ' EXPEDITIOTT. 263 



Colour, in aleoliol — the paxillar area is of very light brown or 

 chocolate-colour, and is mottled with spots and lines of a darker 

 tint of the same. These marks fall in a line parallel with, and 

 midway between, the marginal plates and the median dorsal 

 line. On the inner third of the ray the line or band of colour 

 is generally continuous and meets the corresponding band of the 

 adjacent ray on the disk, forming a V-shaped mark, thickened in 

 the angle. On the outer part of the ray the markings are dis- 

 continuous, forming spots, and these frequently extend up to and 

 over the marginal plates. The actinal surface and sucker-feet 

 are yellowish white. 



Station 186. Lat. 10° 30' S., long. 142° 18' E. Depth 8 fms. ; 

 coral-sand. 



ASTEOPECTEN ZEBEA, var. EOSEA. 



The examples of A> zehra from Station 186 are very constant 

 in their characters. The specimens from Station 187 (three in 

 number) present some variation. In colour they are a rosy 

 brown, approaching that of madder-brown, and the markings are 

 dark brown. The actinal surface is a delicate rosy pink, and the 

 sucker-feet are rich scarlet. The rays are slightly broader and 

 taper rather more rapidly at the tip. Only the two or three inner- 

 most supero-marginal plates bear spines, which are smaller and 

 almost invisible excepting the innermost. The small spinelets on 

 the aboral margin of the infero-marginal plates do not form the 

 continuous line noted in the specimens from Station 186, but are 

 wanting in the median portion, thus leaving the spinelet near 

 the adambulacral plates isolated, and the spinelet near the mar- 

 ginal spines is relatively larger and might almost be counted along 

 with the marginals. 



Station 187. Lat. 10° 36' S., long. 141° 55' E. Depth 6 fms. ; 

 coral-sand. 



AsTEOPECTEN VELiTAETS, vofi Martens. 



Station. Amboina. Depth 100 fms. ; 15-25 fms. 



AsTEOPECTEisr GEANTJLATTJS, MulUr Sf TroscJiel. 



station 188. Lat. 9° 59' S., long. 139° 42' E. Depth 28 fms. ; 

 mud. 



ASTEOPECTEN MONACANTHUS, n. Sp. 



Eays five. i2>3"5r; B=2Q millim., r=7 millim. (another 

 specimen, ^=22 millim., r=Q millim.). Disk moderately large; 

 rays rather long and narrow, tapering rather rapidly on the outer 



