186 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Description. — The centrodorsal is thin discoidal, with the bare polar area flat and 

 from 2 to 3 mm. in diameter. The cirrus sockets are arranged in a single slightly irreg- 

 ular marginal row. 



The cirri are XX-XXI, 25-29, 12 or 13 mm. long. The first segment is short, 

 the next is about two and one-half times as broad as long, and those following slowly 

 increase in length to the fifth or sixth, which is twice as broad as long, and the 

 tenth or twelfth, which is half again as broad as long, still further increasing so that 

 the antepenultimate and one or two of the preceding segments are about as long as 

 broad. The fifth-seventh and succeeding segments have the distal dorsal edge promi- 

 nent, forming a low tranverse ridge which slowly moves anteriorly, attaining a median 

 position on about the twelfth, and gradually narrows distally, becoming reduced to a 

 small median tubercle on the last twelve. The opposing spine is prominent, rather 

 slender, median, equal in height to about half the width of the penultimate segment. 

 The terminal claw is slightly longer than the penultimate segment, moderately slender 

 and moderately curved, rather more so proximally than distally. 



The radials project very slightly beyond the centrodorsal and are slightly sepa- 

 rated distally. The IBrj are oblong or slightly trapezoidal, four times as broad as long. 

 The IBr2 (axUlaries) are broadly pentagonal, twice as broad as long. Synarthrial 

 tubercles are moderately developed. 



The 10 arms are about 80 mm. long. The distal ends of the brachials are only 

 very slightly, if at all produced. 



P» is absent. Pi is 4.5 mm. long, small and slender, with about 14 segments of 

 which the first is short, the second is slightly longer, the third is about as long as broad, 

 and those in the distal portion are half again as long as broad. P2 is 8 mm. long, 

 stouter and stiffer than Pj, though not especially enlarged, with 15-17 segments, of 

 which the first is short, the second and third are about as long as broad, and the 

 remainder are from one-third to one-half again as long as broad, becoming again 

 somewhat shorter at the extreme tip; the segments in the distal half have slightly 

 enlarged distal ends. P3 is 6 mm. long, less stout than P2 though otherwise similar 

 to it, with 14 segments. P4 is 5 mm. long, slightly less stout than P3 but similar to 

 it, with 12 segments. Ps and the following pinnules are 4 mm. long, about as stout 

 as P4 but not stift'ened, with 12 segments which at first are short, becoming about as 

 long as broad on the third, with the remainder longer than broad and half again as 

 long as broad in the distal half. The distal ends of the component segments are 

 slightly everted and spinous. The distal pinnules are 7 mm. long with smooth seg- 

 ments. 



Notes. — In one of the specimens from Muhlos, Maldives, the cirri are XIV, 24. 

 Pi is soft and flexible. P3 resembles Pj, but is smaller. 



In another specimen from the same locality there are 23 cirrus segments. P2 is 

 much enlarged, but Pj and P3 are also enlarged somewhat. 



Localities. — Investigator stintion 152; 11.5 miles S. 83° W. of Colombo Light House, 

 Ceylon; 48 meters; sand, shells, and coral; December 12, 1893 [A. H. Clark, 1912, 

 1918] (6, U. S. N. M., 25483; I. M.). 



Investigator station 59; off the southern coast of Ceylon (lat. 6°06'30" N., long. 

 81°23' E.); 58 meters; sand, shells, and coral; November 11, 1889 [A. H. Clark, 1912, 

 1918] (1, I. M.). 



