CLARK] NEW GENERA OF RECENT EREE CRINOIDS 355 



unquestionably warrant generic separation. This genus is as yet 

 only known from the Mergui and Pelew Islands, and from Amboina ; 

 the only described species is : 



Pontiometra andersoni (P. H. Carpenter) 



10. HIMEROMETRA, gen. nov. 



Centro-dorsal discoidal, bearing 20 to 40 (usually about 30) cirri 

 in one or two (sometimes three) marginal rows; cirri with 20-40 

 segments, which are very uniform in size, rarely longer than wide 

 (never much so), medium in length or rather short, moderately 

 stout and smooth, or with small dorsal spines ; costals short, united 

 by bifascial articulation, always rounded (never carinate), more or 

 less convex longitudinally, which gives them a characteristic swollen 

 appearance, and usually more or less tubercular at the joint; they 

 may or may not be in apposition, and are sometimes strongly "wall- 

 sided;" distichals and palmars either 2, or 4 (3 + 4) or both; arms 

 ten to about fifty in number, the brachials always much wider than 

 long, with more or less prominent and overlapping distal edges, 

 quadrate or oblong, never triangular; always rounded, and never 

 carinate ; disk and ambulacra naked, but the former may have a few 

 small scattered calcareous granules ; syzygia irregular, but the third 

 and fourth brachials usually joined by syzygy, and other syzygia at 

 more or less frequent intervals throughout the arms ; one or more of 

 the proximal pinnules greatly enlarged, stout, styliform (or more or 

 less recurved), with cylindrical segments, tapering gradually from 

 the base to the slender tip ; rarely the distal segments are dispropor- 

 tionately small ; distal pinnules slender, the proximal segments not 

 specially marked, the distal not specially elongate. 



Color in life purple or reddish purple, the skeleton lighter, often 

 more or less blotched or streaked; sometimes very dark brown or 

 nearly black, but this appears to be a more or less local variation. 



Type of the genus. — Ante don crassipinna Hartlaub, 1890. 



Himerometra includes parts of Dr. Carpenter's "Milberti," "Pal- 

 mata," and "Savignii" groups, and a close examination will show it 

 to be a very well defined and homogeneous genus, presenting, as a 

 whole, a number of interesting characters not found in any other. 

 The peculiar swollen appearance of the costals, and usually also of 

 the distichals, palmars, and lower brachials, which are often or 

 usually more or less tubercular, is very characteristic. The costals 

 and lower brachials, with the intervening distichal and palmar series 

 (when present), are always smooth, and never overlap. Antedon 

 crassipinna has been chosen as the type first, because it is a distinctly 



