402 PROCEEDINGS OF THE NATIONAL MUSEUM. voi- xxxvi. 



ish, then very gradually becoming longer than broad, and twice as long 

 as broad in the terminal portion; the last six joints taper rather rap- 

 idly, and the last two joints are minute; from the fourth joint onward 

 small spines are developed on the distal border, on the distal angle of 

 the pinnule, and the last four joints have, in addition, a somewhat 

 longer spine developed on the corresponding interior angle. P, 

 15 mm. long, with sixteen joints, all but the basal proportionately 

 longer than those of P^, the distal with long spines on their prisnuitic 

 angles; Pr, similar, slightly longer; Pg similar, 17 mm. long; P,„ is 19 

 mm. long, with twenty joints, becoming elongate distally, with long 

 spines at the prismatic angles; in the terminal part of the arms the 

 pinnules slowly decrease in length. The abrupt distal taper gives the 

 pinnules the appearance of having been broken off at the tip and sub- 

 sequently repaired. 



Color. — Yellow-brown. 



Tf/pc—Cat. No. 25466, U.S.N.M., from Alhatross station 5252; 

 Rakiputan Strait, between the northern end of Samal Island and the 

 western shore of Davao Bay: 2S fathoms. 



Family THALASS0MP:TKID.E. 



Subflunily THALASSOMPCXRIN"^. 



Genus STENOMETRA A. H. Clark. 



STENOMETRA ARACHNOIDES, new species. 



Centro-dorsal moderate, columnar, broader basally than long, de- 

 creasing slightly in diameter di.stally, the bare polar area 2 mm. in 

 diameter; cirrus sockets arranged in ten colunnis of two each, closely 

 crowded. 



Cirri XX (XII in the type), 61-()5, 30 nnn. long; first four joints 

 subequal, averaging twice as broad as long, rather prominently over- 

 lapping all around; fifth joint nearly half again as long as broad, a 

 more or less marked transition joint; sixth joint about the same 

 length or slightly shorter; next five joints approximately squarish, 

 then gradually decreasing in length, those in the distal half of the 

 cirrus being twice as broad as long, or even slightly shorter; the 

 fourteenth or fifteenth and following joints bear prominent dorsal 

 spines. 



Disk and ambulacra well plated. 



Ends of the basal rays visible as dorso-ventrally elongate tubercles 

 in the angles of the calyx; radials concealed, or with the distal, 

 coarsely spinous, margin just visible over the ends of the basal rays; 

 I Bri very narrow, chevron shaped, with abruptly everted, coarsely 

 spinous edges, in close apposition laterally; I Br^ (axillary) rhombic, 

 twice as broad as long, the edges concave, abruptly everted and 

 coarsely spinous all around, a high sharp median keel in the proximal 

 two-thirds. 



