160 ECHTNODERMA OF THE INDIAN MtTSEUM, PART VH. 



Description. — Centrodorsal thin, discoidal, the hare polar area flat, 2 mm. 

 to 3 mm. in diametei' ; cirrus sockets arranged in a single slightly irregular crowd- 

 ed marginal row. 



Cirri XX-XXI, :2r)-2!», 12 mm. or 1:5 mm. long: first segment short, tlie next 

 about two and one Jialf times as broad as long, the following slowly increasing in 

 length to the fifth or sixth, which is twice as broafl as long, and the tentli or 

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

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

 as broad ; fifth to seventh and succeeding segments with the distal dorsal edge prom- 

 inent, forming a low transverse 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 ; opposing spine prominent , 

 rather slender, median, equal in height to about one half the diameter of the 

 penultimate segment ; terminal claw slightly longer than the penultimate seg- 

 ment, moderately slender and moderately curved, rather more so proximally than 

 distally. 



Radials projecting very slightly beyond the centrodorsal, slightly separated 

 distally; FRr, oblong or slightly trapezoidal, four times as broad as long; IBr, 

 broadly pentagonal, twice as broad as long; synarthrial tubercles moderately 

 developed. 



Ten arms about so mm. long, resembling those of D. stiideri : distal ends of 

 the brachials very slightly if at all produced. 



Pa absent ; P^ 4-5 mm. long, small and slender, with about fourteen seg- 

 ments, the first short, the second slightly longer, the third squarish, those in the 

 distal portion being half again as long as broad; P, s mm. long, stouter and 

 stiffer than P, though not especially enlarged, with fifteen to seventeen segments, 

 the first short, the second and third squarish, the remainder 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 ; P.. 6 mm. 

 long, less stout than P,, but similar to it, with fourteen segments; P^ 5 mm. 

 lon», slightly less stout than P.,, but similar, with twelve segments; P, and 

 following pinnules 4 mm. long, about as stout as P.j, but not stiffened, with 

 twelve segments, tlie third squarish, the remainder longer than broad, becoming 

 half again as long as liroad in the distal half ; the distal ends of the component 

 segments are slightly everted and spinous ; distal pinnules slender with smooth 

 segments, 7 mm. long. 



The colour in spirits is violet, the cirri and a few small blotches on the arms 

 and pinnules, the synarthrial tubercles, and a median line on the arm bases, yel- 

 low ; or, brownish yellow narrowly banded with purple. 



Localities. — Off Colombo Light House, Ceylon: ;2fiJ fathoms (Type Local- 

 ity). — Six specimens. 



South of Ceylon (i\° 6-5' N. lat., 81° 23' E. long.); 32 fathoms.— One large 

 specimen. 



