A. H. CLARK: THE CRINOIDS OF THE INDIAN OCEAN. 317 



HETEROMETRA REYNAUDII. 



Locality. — Northeastern Ceylon : Entrance to Palk Strait.^, Point Pedro 

 bearing SSE., distant about three miles ; 6 — S fathoms; sandy bottom. — Ten speci- 

 mens. One of these has fourteen arms, four IIBr series being present, all 4 

 (3+4) ; one has sixteen arms, five of the six IIBr series being 4 (3+4) and one 2; 

 two have twenty arms, eight of the ten IIBr series being 4 (3+4) and two 2 ; one 

 has twenty arms, seven of the ten IIBr series being 4 (3+4) and three 2; one 

 has twenty-one arms, all the IIBr series being 4 (3 + 4), and all the IIIBr series, 

 which are internally developed, 2 ; the remaining four are badly broken. 



HETEROMETRA PULCHRA, sp. nov. 



Description.— Centrodorsal low-hemispherical, the dorsal pole slightly 

 convex, finely pitted, 3-5 mm. in diameter ; the cirrus sockets are arranged in two 

 irregular rows. 



Cirri XX, 32-39 (usually nearer the latter), 25 mm. long ; the longest cirrus 

 segments are slightly longer than broad ; the short distal segments are but little 

 broader than long ; rather small, though sharp and prominent, dorsal spines are 

 developed from the twentieth segment onward. 



The radials are just visible beyond the edge of the centrodorsal ; the IBr, 

 are very short, band-like, about six times as broad as long; IBr, nearly three 

 times as broad as long, the lateral edges sliglitly more than half as long as those 

 of the IBr^ ; the division series are well rounded dorsally, in lateral apposition 

 and laterally flattened as far as P^,, with the sides slightly produced outward ; 

 the ossicles of the IIBr and IIIBr series are interiorly in lateral apposition 

 through slightly produced edges. Eight IIBr series are present, six of which are 

 4 (3+4) and two of which are 2; there are six IIIBr series, all 2, and all de- 

 veloped mternally except one, which is developed externally by the side of an 

 internal series. 



There are twenty-four arms (in the type) about S5 mm. long, perfectly 

 smooth, and well rounded dorsally. 



Pd-Is 6 mm. long with twenty-two short segments, none of which are longer 

 than broad ; the second-fifth segments are strongly carinate dorsally, and 

 from the sixth segment onward the pinnule is rather strongly prismatic. P, is 

 12 mm. long with twenty-seven segments, all of which are short, the distal being 

 scarcely twice as long as broad ; the second-sixth are strongly carinate, and the 

 pinnule is prismatic from the seventh onward. P.^ is 13 mm. long with twenty- 

 five segments, resembluig P, but with more elongate segments distally ; the 

 second-sixth segments are carinate. P, is the largest and longest pinnule, 14 mm. 

 long, slightly stouter throughout than P^, with twenty-two segments, of which 

 the second-seventh are carmate ; a supplementary carinatioa extends along the 

 pinnule from the sixth segment to the tip. P^ is 9 mm. long with eighteen seg- 



