A. H. CLARK: THE CRINOIDS OF THE INDIAN OCEAN. 163 



shaped, about twice as broad as their exterior length; third and fourth (syzygial 

 pair) oblong or slightly longer interiorly than exteriorly, once and one half times 

 to twice as broad as long ; next four or five brachials oblong, about three times 

 as broad as long, then becoming very obliquely wedge-shaped, almost triangular, 

 half again as broad as long, in the distal portion of the arm less obliquely wedge- 

 shaped and somewhat longer, and in the terminal portion longer than broad. 

 Syzygies occur between the third and fourth brachials, again between the ninth 

 and tenth and fourteenth and fifteenth, and distally at intervals of from four to 

 eight (usually six or seven) oblique muscular articulations. The second syzygy 

 is occasionally between the fifth and sixth brachials, and the third may be as far 

 out as between the sixteenth and seventeenth. 



P absent; P, small and weak, 4 mm. long with fourteen segments, the first 

 .short, the second squarish, the following gradually increasing in length, becoming 

 twice as long as broad distally ; the segments in the distal third liave the edges 

 armed with fine spines ; P^ 13 mm. long, stouter than P, , though of the same propor- 

 tions, with seventeen segments, which become squarish on the third and twice 

 as long as broad terminally ; second and following with a few spines on the distal 

 edge; P^ 6 mm. long, basally as stout as P^ but not tapering so rapidly, and 

 therefore less delicate distally, with fifteen segments, the distal elongated ; P^ 

 4 mm. long, not so delicate as P,, with ten segments ; P, 3 mm. long; following 

 pinnules increasing slowly in length, the distal pinnules being 7 mm. long, slender, 

 with elongated segments. 



The colour in spirits is brown, the perisome darker. 



Localities. — ? Kurrachi. — The type. 



KuRRACHi. — Six specimens. 



REM.4RKS. — In the British Museum I found six specimens of this species from 

 Kurrachi; the cirri are XII-XV, 20-23, 10 mm. long; the dorsal processes on the 

 cirrus segments, as in the type, are very small; most of the cirrus segments are 

 about twice as bjoad as long. P, has about thirteen segments, and resembles 

 P., but is sliorter and correspondingly more slender; P, is the largest, but is 

 slender ; most of its segments are about twice as long as broad or even longer ; 

 the segments number about fourteen ; those in the outer half have projecting 

 outer corners ; P^ is about like P, ; P^ is shorter, and P^ is shorter .still ; sometimes 

 P is considerably shorter than P.^ or than P^. The arms are 65 mm. long. 



DECAMETRA MODICA. 

 Decametra modica 1911. A. H. Clark, Proc. U. S. Nat. Mus., vol. 40, p. 32. 

 Habitat. — Bagamoyo, German East Africa. 



DECAMETRA MOBIUST. 



? Antedon latvissima (part) 1902. Bell, in Gardiner, Fauna and Geography of 

 the Maldive and Laccadive Archipelagoes, vol. 1, part 3, p. 224. 



