ASTEEOIDEA OP H.M.S. ' CHAI/LENGEE ' EXPEDITIOlSr. 249 



** Marginal spines 2, side by side. 



Infero-marginal plates covered with squamules. 

 An aboral line of spinelets present. Mar- 

 ginal spines taper and pointed. Supero- 

 marginal plates very broad cingulatus. 



*** Marginal spines 4, in an oblique line. 



Ambulacral spines all cylindrical and taper. 

 Infero-marginal plates with papillose spinelets 

 rather than squamules, No aboral line of spine- 

 lets. Supero-marginal plates not very broad . mesactus, 



AsTKOPECTEisr BEASiLiENSis, Muller 8f TroscTiel. 



Station. Off Baliia. Depth 7-20 fms. 



Station. Off Eernando ISToronha. Shallovtr water. 



ASTEOPECTEN BEEVISPIITUS, n. sp. 



Eays five. i2=3"2r; i2 = 32 millim., r=10 millim. Eays 

 tapering regularly from tlie base to tlie tip and terminating in a 

 point. Breadth of a ray at the base about 11 millim. Inter- 

 brachia! angles slightly rounded. 



Supero-marginal plates 22 in number from the interbra- 

 chial line to the tip, higher than broad along the inner half of 

 the ray, but broader than high on the outer portion. Each 

 plate (excepting two or three in the arm-angle and a few at the 

 extremity) bears two small, conical, sharply pointed spines. 

 The inner series are placed close to the inner edge of the plate, 

 and are continuous from the arm-angle until near the tip, de- 

 creasing in size as they proceed outward, until they disappear 

 altogether. The outer series are slightly larger, and are placed 

 at the extreme edge of the plate on the rounding where the 

 dorsal and lateral superficies converge ; they are continuous 

 throughout the ray, excepting the innermost plate in the arm- 

 angle. 



Infero-marginal plates higher than broad, and flush with the 

 superior series. Each plate bears a single marginal spine, short, 

 tapering continuously frombase to tip, sharply pointed and slightly 

 compressed. On the inner half of the ray, two similar and 

 slightly smaller spines are situated on the median line of the 

 plate — one, which is the smallest, not far from the inner edge of 

 the plate adjoining the adambulacral plates, and the other about 

 midway between this spine and the marginal spine, the three 

 forming a lineal series transverse in relation to the direction of 

 the ray. On the outer portion of the ray the inner spine is 



