NO. 1820 RECENT CRINOIDS FROM PHILIPPINES— CLARK 23I 



Genotype. — Burnet ra chaniherlaini. 



The numerous and slender cirri with greatly elongated joints, no 

 opposing spine, and an almost straight terminal claw, combined with 

 the very stiff lower pinnules of which the third is much the longest 

 make this genus easily recognizable. 



EUMETRA CHAMBERLAINI. new species 



Centro-dorsal hemispherical, rather low, bearing forty to sixty 

 cirrus sockets in four or five closely crowded alternating rows. 



Cirri long, xl-lx^ 25, slender and delicate; first joint very short, 

 second squarish, third about half again as long as broad, fourth 

 nearly four times as long as its proximal diameter, fifth and follow- 

 ing about five times as long as their proximal diameter ; terminal ten 

 or twelve joints decreasing very slightly in length, so that the last 

 three or four are only about two and one-half times as long as 

 broad; penultimate joint slightly over twice as long as its proximal 

 diameter, decreasing slightly in diameter distally ; no opposing spine ; 

 terminal claw about three-quarters the length of the penultimate 

 joint, slender, evenly tapering, very slightly curved; the distal half 

 of each cirrus joint is slightly and very gradually expanded, and the 

 distal edges are prominent; cirri rather strongly compressed 

 throughout. 



Radials even with the edge of the centro-dorsal ; first costals ex- 

 tremely short, divided in the median line by a posterior projection 

 from the costal axillaries, and bearing more or less prominent 

 rounded tubercles in the antero-lateral angles ; costal axillaries rhom- 

 bic, about once and one-half as broad as long, the sides strongly con- 

 cave, the anterior angle sharp and somewhat produced ; costals and 

 first two brachials in close apposition ; synarthrial articulations be- 

 tween the costals and the first two brachials rising to a very promi- 

 nent tubercle. Ten arms ; first brachial about twice as long ex- 

 teriorly as interiorly, deeply incised in the median line, the bases of 

 adjacent first brachials just meeting over the anterior angles of the 

 costal axillaries ; second brachial much larger, irregularly quadrate, 

 with a strong posterior prolongation incising the first brachial ; third 

 and fourth brachials (syzygial pair) rather more than twice as 

 broad as long in the median line, rather longer inwardly than out- 

 wardly; next four brachials and the next syzygial pair (ninth and 

 tenth brachials) slightly wedge-shaped, about twice as broad as 

 long; brachials then becoming triangular, at first not so long as 

 broad, soon becoming as long as broad, and distally wedge-shaped 

 again, and, in the terminal portion of the arms elongate ; brachials 

 smooth, not overlapping. Svzvgies occur between the third and 



