A. H. CLARK : THE CRINOIDS OF THE INDIAN OCEAN. 133 



resembling those of such species as S. monacantha ; the longest segment is about 

 twice as long as its median diameter ; the longer proximal segments are some- 

 what constricted centrally; the IIIBr series are externally developed; the 

 ventrolateral tubercles on the elements of the division series are well developed 

 and thick. P.^ is the largest, with 16, 16, 17 segments; Pj is similar, but not 

 quite so long ; P^ is much shorter than Pj, stiff, with eleven or twelve segments • 

 Pj is slightly shorter than P^ and is like the succeeding pinnules instead of being 

 stiff like the preceding, though it may be a trifle stiffer than its successors. 



It is quite probable that this is in reality the same as the succeeding species, 

 as the only tangible difference is the greater number of segments in the enlarged 

 lower pinnules. So far as has been observed, however, this is a constant charac- 

 ter, and, as exactly the same difiference serves to distinguish S. indica from S. 

 monacantha, it may be found always to hold good. 



STEPHANOMETRA TUBERCULATA. 



Antedon tuber culata 1888. P. H. Carpenter, "Challenger" Reports, vol. 26, 



Zoology, p. 232, pi. xlv, figs. 2, 3. 

 Antedon'^. apicata 1894. Bell, P. Z. S., 1894, p. 396. 

 Stephanometra tuberculata 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 



22, p. 10. 



Habitat. — Singapore; Pulau Ubin, Singapore; Macclesfield Bank; Cocos 

 Island ; Lifu, Loyalty Islands ; ? Fiji. 



Depth. — Littoral, and down to 35 fathoms. 



Remarks. — In the type of this species, preserved in the British Museum, 

 Pj is slender and flexible, very slender distally ; P^ is large and spine-like ; P, is 

 spine-like, hke P^, but shorter; P^ is small and weak and very short, but some- 

 what stiffened, P.^ has twelve segments, and is nearly half again as long 

 as Pg. 



STEPHANOMETRA CORONATA. 



Stephanometra coronata 1909. A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 

 p. 639. 



Description.— Cirri XXII-XXIII, 25-30, 22 mm. long, resembling those of 

 <S'. tenuipinna ; the longest segments are about one third longer than broad ; the 

 ninth, tenth, or eleventh is a well-marked transition segment. 



Radials projecting slightly beyond the edge of the centrodorsal ; IBr[ oblong, 

 short, about three and one half or four times as broad as long, not in lateral ap- 

 position, with a rounded ventrolateral process in the proximal lialf ; IBr^ broadly 

 pentagonal, twice as broad as long, the lateral edges about half as long as those 

 of the IBr, , produced into a rounded prominent ventrolateral process ; synarth- 

 rial tubercles rather prominent; IIBr series, IIIBr series, and IVBr series (when 

 present) 2 ; elements of the division series and first brachials with prominent 

 rounded ventrolateral processes. 



