A. H. CLARK: THE CRINOIDS OF THE INDIAN OCEAN. 321 



CENOMETRA HERDMANI. 



Locality. — Off Gopalpore ; 25 — 28 fathoms. — Two specimens. 



Remarks. — The two specimens have twenty -eight and twenty-nine arms, 

 about 100 mm. long. The three specimens in the type series have twenty-three, 

 twenty-four and twenty-five arms, and the specimen recorded from the Glanjam 

 coast has twenty-four. 



COLOBOMETRA DISCOLOR. 



hoCAUTY.— Southwest of the. mouths of the Irrawaddy River; " Investigator " 

 Station 387 (15° 25' N. lat., 93° 45' E. long.); 49—40 fathoms.— One specimen. 



Remarks. — This is a large example with the arms 110 mm. and the cirri 

 22 mm. long. It differs from the other specimens at hand in having P.^ and P,, 

 though enlarged and stiffened, recurved instead of being straightened as usual. 



The cirri are XVII, 34; one of them has a regenerating tip. 



P^ is 6 mm. long, weak and delicate, with sixteen segments; P.^ is 10 mm. 

 to 12 mm. long, stiff, but recumbent, with sixteen segments; Pj is 9-5 mm. 

 to ir5 mm. long, similar to P^, with seventeen segments; P^ is 10 mm. long 

 with sixteen segments which are slightly shorter than those of the preceding 

 pinnules; the pinnule is slightly less stiff than those preceding; Pj is 8 mm. 

 long with fifteen segments, and is less stiff than P^; P, is 8 mm. long with 

 fourteen segments, slightly weaker than the preceding pinnule ; P, and the 

 following pinnules have slightly broader segments ; the distal pinnules are 

 slender, 115 mm. long. 



PROMETRA, subgen. nov. 



Genotype. — Golohometra chadwicki A. H. Clark, 1911. 



Diagnosis. — Similar to Golohometra as restricted (including the species 

 perspinosa, diadema, vepretum, suavis and discolor) ; but the cirri are short with 

 less than twenty-five segments, all of which are subequal and all, or at least the 

 outer, about as long as broad. 



Range. — Red Sea to .southern Japan. 



Depth. — 10 — 55 fathoms. 



COLOBOMETRA (PROMETRA) BREVICIRRA, sp. nov. 



Description. — Centrodorsal broad and flat as in G. (P.) chadwicki, the 

 cirri arranged in a single marginal row. 



Cirri XIV, 21—23 (usually the latter), 8 mm. long; the majority of the 

 cirrus segments are about twice as broad as long, but in the outer half of the 

 cirri the segments very slowly increase in length so that the antepenultimate is 

 nearly or quite as long as broad. The earlier segments have thickened distal 

 edges: on the fifth this production of the distal edge begins to divide, the lateral 

 portions becoming swollen and a notch developing in the crest ; on tiie ninth 



