'53 



In general appearance this species is intermediate between gigantea and annandalei, 

 thougfh rather more like the former. 



It differs from giganten in having keels on the proximal elements of the pairs of ossicles 

 forming the division series, and the first pair of brachials as well as on the distal ; in the more 

 numerously jointed, more slender, and relatively longer cirri ; in having more numerous arms 

 (28 instead of 17); in the absence of interradial ridges separating the columns of cirrus sockets 

 on the centrodorsal ; in the much less spinous borders of the division series and lower brachials ; 

 and in having the IIIBr series 4(3 4- 4) instead of 2. 



It differs from annaudalci in being larger and more robust ; in having no spines on 

 the dorsal surface of the proximal ossicles; in having the ossicles of the division series with 

 irregularly dentate produced lateral borders instead of smooth ; in the much less spinous dorsal 

 surface of the earlier brachials; and in the larger and stouter cirri. 



3. Occanometra annaudalci (A. H. Clark). 



A. H. Clark. Proc. U.S. National Museum, vol. 36, [909, p. 406 [Crotalometra eupedata; 



eleven armed example). 

 — ■ — Proc. U. S. National Museum, vol. 36, 1909, p. 642 [Crotalometra annandalei). 



Proc. U.S. National Museum, vol. 39, 191 1, p. 551 [Tlialassometra annandalei). 



Crinoids of the Indian Ocean, 191 2, p. 195, fig. 35, p. 196 {Tlialassometra annandalei). 



Cosmiometra A. H. Clark. 



Key to the Species of the Genus Cosmiometra. 



a 1 28 arms, a IIIBr series being developed on the outer side of each IIBr series, 

 100 mm. long; cirri with about 40 segments, 25 mm. to 30 mm. long; 

 ossicles of the division series with everted, though perfectly smooth, edges, 

 and a narrow and low, but prominent median carination which, becoming 

 zigzag on the triangular brachials bevond the arm bases, is continued to 



the arm tips (Hawaiian Islands; 574 Metres) delicata 



a 3 20 arms; no IIIBr series developed 



b 1 elements of the division series ancl first two brachials with numerous fine 

 spines, either in a broad band along the lateral borders of the dorsal 

 surface, or in a row aionor the entire everted border of each ossicle 

 c 1 radials, lateral third of the IBr series, and lateral fourth of the IIBr 

 series covered with a band of densely packed fine spinules ; edges of 

 the ossicles of the division series and brachials with a row of very 

 fine spinules, but not everted; no carination on the division series or 

 arms; arms 100 mm. to 130 mm. in length; cirri with 49 — 61 seg- 

 ments (Kei Islands t o northern Mindanao, P h i 1 i p p i 11 e s ; 



304 — 612 Metres) philippinensis 



c 2 radials concealed; lateral borders and proximal and distal edges of 

 the ossicles of the division series and first two brachials everted and 



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