A. H. CLARK : THE CRINOIDS OF THE INDIAN OCEAN. 165 



Remarks. — In the type, which T examined at Leyden, the cirri are XIII, 53, 

 55, 56, 57, 58 and 59, long, and comparatively slender, 47 mm. long, tapering 

 slightly in the distal half ; tlie longer proximal segments are slightly (about one 

 third) longer than broad. P„ is absent. The IBr, is three times as broad as long ; 

 the [Br^ is twice as broad as long; both these segments are comparatively short. 

 The synarthrial tubercles are small, but well marked, with the proximal half (on 

 the IBr,) more or less spinous. P, is slightly stiffened, about two thirds the 

 length of Pj, with about fifteen segments which become squarish on the third and 

 distally three times as long as broad. P, is enlarged and greatly stiffened. P, is 

 slightly larger than P^, but similar to it. The following pinnules to P, or P^ are 

 similar, but slowly decrease in length and thickness ; the following are only 

 slightly stiffened. The distal pinnules are very long and slender with about twenty- 

 seven segments. The proximal pinnules are comparatively slender, not so stout 

 as those of 0. vepretum; the cirri are also less stout than those of that species. 

 Pi is rather strongly prismatic , and the following pinnules are prismatic for a 

 diminishing distance basally. The arms are 1-tO mm. long. 



Another specimen at Leyden, from Amboina, i.s exactly like the type; the 

 cirri are XII, 56-65, like those of the type. 



The comparative slenderness of the proximal pinnules of this species, and the 

 stiffness of P, , which has elongated segments , appear to separate this form sharph' 

 from G. vepretum and to place it in the diadema group of species. 



COLOBOMETRA DIADEMA. 



Colobometru iliadcina l!»l(i. A. H. Clark, Proc. Biol. Soc. Washington, vol. 23, 

 p. 7. 

 Habitat. — ^Ugi, Solomon Islands. 



COLOBOMETRA VEPRETUM. 



Antedon perspinosa 1891. Hartlaub, Nova Acta Acad. German., vol. 58, No. 1^ 



p. 85 (part), pi. 5, fig. 54. 

 Colobometm vcprctntn 191)9. A. H. (Jlark, Vidensk. Medd. fra den naturhist. 



Forening i Kobenhavn, 1909, p. 174. 



Habit.\t. — Amboina ; Singapore. 



COLOBOMETRA SUAVIS. 



Ci/llometm saavis 1908. A. H. Clark, Smiths. :\Iiscell. Coll. (Quarterly Issue), 



vol. 25, part 2, p. 220. 

 Colobometra suavis 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 



p. 8. 



H.4BITAT. — Philijjpine Islands. 

 Depth. — 20-23 fathoms. 



