834 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



at the sides, with the result that at the distal portion of the interradial areas there is a 

 well-marked interradial furrow. 



The IBri are proxinially about as broad as the lateral length, and distally slightly 

 broader, though not quite twice as broad as the median length. The lateral length is 

 half again as great as the median length, due to incision by a posterior process from the 

 axillary. The lateral edges are straight, diverging somewhat, and entirely free. The 

 IBr 2 (axillaries) are rhombic, the lateral angles slightly truncated and continuing the 

 direction of the lateral edges of the IBr^ the anterior angle and the posterior process 

 incising the IBrj are about equally produced, and are similar. All four edges are 

 slightly concave. 



All 10 arms are broken off at the syzygy between brachials 3 + 4; the length from 

 the tip of the centrodorsal to the distal face of the third brachial is 9 mm. The first 

 brachial is wedge-shaped, with the proximal and distal edges slightly concave, and is 

 about as broad as the external (greater) length. The internal length is not much more 

 than half the external length. The internal edges are entirely free. The second 

 brachial is larger than the first, irregularly quadrate in form. The third is nearly twice 

 as long interiorly as exteriorly, and about as broad as the exterior length. [Presum- 

 ably there was no pinnule on the second brachial since none was mentioned. A.M.C.] 



Locality Siboga station 177; north of Ceram (lat. 224'30" S., long. 12938'30" 

 E.); 1633 meters (during the haul the depth diminished to 1300 meters); dead coral 

 and stones, covered with manganese; September 1, 1899 [A. H. Clark, 1912, 1918] 

 (1, Amsterdam Mus.). 



Remarks [by A.M.C.]. The type specimen was seen by me in Amsterdam in 

 November 1957. Unfortunately, it was found to be less complete than when it was 

 first described, the basals and radials together being detached from the centrodorsal 

 and only a single IBri remaining attached to them, though a second was loose in the 

 jar; the cirri and arm ossicles to the first syzygy were missing. 



