NO. 24 FOUR NEW BRITTLESTARS CLARK 5 



the disk. The genital slits are rather short and are slightly sinuous. 

 The papillae bordering the lo genital slits and the 5 mouth slits are 

 rather abruptly elevated. 



There are two pairs of tentacle pores, each of the pores protected 

 by a single large rounded tentacle scale attached to the side arm plate. 

 There are four arm spines, the two lowest longer and stouter than 

 the two uppermost, the second from the oral surface being the largest 

 and longest. The two uppermost arm spines are short and slender; 

 one of these, the shorter, is situated on the upper surface of the side 

 arm plate and is directetl forward. 



OPHIOCIRCE ANTILLARUM, n. sp. 



Plate 3, figs. 7-9 



Locality. — Caroline station 99; off the Virgin Lslands (lat. i8°4o' 

 N., long. 84°5i' W.) ; 220 fathoms; March 3, 1933. Thirteen speci- 

 mens (U.S.N.M. nos. E.5198 [type] and E.5199). 



Description. — The disk is approximately circular, bowing outward 

 between and more or less strongly incurved over the arm bases, flat 

 and thick, 4.5 mm in diameter. The arms are 38 mm long. They are 

 slender and evenly tapering. In cross-section they form aborally a 

 sharp right angle with straight sides ; orally they are lower, with a 

 broadly rounded angle; the lateral angles are abrupt, but rounded. 



The aboral surface of the disk is densely beset with minute slightly 

 roughened granules which are about twice as large as those on the 

 tlisk of Ophiopyren longispinus. Ordinarily the radial shields are 

 completely covered, but the granules may be rubbed off from their 

 well separated outer ends. Beyond the radial shields the granules 

 extend over the proximal half of the first upper arm plate. 



On the oral surface the granules are continued inward over all the 

 plates to the bases of the mouth papillae. They are less crowded here 

 than on the aboral surface. In most instances in the specimens as 

 preserved they have been rubbed off the mouth shields, and more or 

 less extensively removed from the other plates. The mouth shields 

 are triangular with the lateral angles rounded, slightly broader than 

 long. The adoral shields are large with approximately parallel sides. 

 They extend distally for about one-third of their length beyond the 

 lateral angles of the oral shields, and are proximally broadly in con- 

 tact beyond them. The jaw plates are small, very low triangular. The 

 mouth papillae number seven on each side of the mouth angle. The 

 outermost is large and broadly rounded, and is attached to the adoral 

 shield. The second is similar but slightly smaller, and is attached to 



