A. H. CLARK: THE CRINOIDS OF THE INDIAN OCEAN. 181 



In spirits the calyx, division series, and sides of the arms are light brown; a 

 broad median band on the arms, most of the pinnules, and the cirri, are white. 

 Habitat. — Unknown; the type is in the British Museum. 



Genus NEOMETRA, nov. 



Genotype. — Antedon multicolor A. H. Clark, 1907. 



Diagnosis.— A genus of Galometrida' in which the IIBr series are 2; the 

 centrodorsal is thick discoidal or hemispherical, with from one to three marginal 

 rows of cirrus sockets; the cirri are of moderate length, one third as long as the 

 arms ; the radials are produced interradially in the form of a broad process which 

 entirely and widely separates the bases of the IBr^ ; the elements of the IBr series 

 have smooth sides without lateral projections, and are widely separated- the 

 brachials are long, so that the pinnules, which are stiff, but slender, appear rather 

 widely separated. 



NEOMETRA SPINOSISSIMA. 



Caloinetm .rpinosissima 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 



p. 79 . 



Description. — Centrodor.sal discoidal, moderately thick, the bare polar area 

 i\iit, 3 mm. in diameter; cirrus sockets arranged in a single crowded marginal row 



Cirri XI, 42-53, moderately slender, 2.5 mm. long ; first segment about three 

 times as broad as long, the following slowly increasing in length to the sixth or 

 seventh, which is nearly as long as broad, then remaining similar to the twelfth or 

 fifteenth, then very gradually decreasing so that the segments in the terminal 

 portion are twice as broad as long ; at about the fifteenth a low sharp dorsal ked 

 makes its appearance, at first in the distal portion only, but soon along the entire 

 dorsal surface, which very slowly increases in height, becoming very prominent on 

 the short terminal segments though never exceeding more than one fourth of 

 their diameter in height ; opposing spine and terminal claw as in N. multicolor. 



Disk lacking: side and covering plates very highly developed along the 

 brachial and pinnule ambulacra. 



Ends of the basal rays visible as small tubercles or small rhombic areas in 

 the angles of the calyx, but not rai.sed above the general surface of the radials 

 and therefore not especially obvious ; radials short in the median line, but extend- 

 ing up into the angles of the calyx in the form of an equilateral triangle the 

 rounded apex of which entirely separates the bases of the IBr, ; IBr, slightly 

 trapezoidal, about two and one half times as broad as long, the ventrolateral 

 margins very thin ; IBr^ pentagonal, as long as, or only very slightly shorter than, 

 broad, the lateral edges nearly as quite as long as those of the IBr,, slightly 

 constricted just below the lateral angles; IIBr 2, the first united in the proximal 

 two thirds, diverging at approximately a right angle distally. 



Nineteen arms (in the tyjje) 130 mm. long, resembling in the main those of 



