A. H. CLARK : THE CRINOIPS OF THE INDIAN OCEAN. 23fl 



same length or slightly longer, as in Heliovietra and Solannmetra , and by the outer 

 segments of P,, which are somewhat elongated instead of very short. 



CYCI.OMETRA FLAVESCENS, sp. no v. 



Description. — Centrodorsal rounded conical. 



Cirri XXVIII, 41-43, .30 mm. long ; first segment short, second nearly as long 

 as broad, the following gradually increasing in length and becoming twice as long 

 as broad on the fourth ; the next five are similar : the following gradually 

 decrease in lengtli, after about six more becoming about as long as broad and 

 remaining of those proportions until the end of the cirrus. The earlier segments 

 are slightly constricted centrally, with the distal ends all around finely spinous ; 

 the short outer segments ai'e carinate, this carination appearing convex in lateral 

 view. 



The ten arms are 130 mm. long ; the IBr series and brachials are essentially 

 as in Antedon bifida, but the distal ends of the brachials are more prominent and 

 are finely spinous. Syzygies occur between the third and fourth brachials, 

 again between the ninth and tenth and fourteenth and fifteenth , and distally at 

 intervals three or four oblique muscular articulations. 



P, is very long. 17 mm. to 19 mm. in length, with from forty-two to forty-five 

 segments of which the first seven are broader than long, those after the tenth or 

 eleventh longer than broad, and the distal shglitly elongated ; P.^ is apparently 

 similar, but shorter ; P.. bears a genital gland. The distal pinnules are exceed- 

 ingly slender, 17 mm. long. 



The colour in spirits is yellow. 



Locality. — South of Ras Sharwein, Arabia; or, northwest of Sokotra (14° 20' 

 N. lat., 52° 30' E. long.); 1200 fathoms. 



Remarks. — The type of this species, which was collected by the cable repair 

 ship " Electra," is in the British Museum. 



CYCLOMETRA CLIO. 

 Antedon clio 1907. A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, p. 79. 

 Habitat. — Southwestern Japan. 

 Depth. — 107 fathoms. 



Genus TRICHOMETRA. 



Trichometra 1908. A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, p. 131 

 (Antedon aspera A. H. Clark, 1908). 



TRICHOMETRA EXPLICATA. 



Trichometra explicata 190S. A. H. Clark, Smiths. Miscell. Coll. (Quarterly Issue), 

 vol. 52, part 2, p. 232. 



