608 CLARK: NEW GENERA OF CRINOIDS 



Calyptometra, new genus 



Genotype. — Charitometra lateralis A. H. Clark, 1908. 



Diagnosis. — A genus of Charitometridae in which the proximal por- 

 tion of the animal is robust, very broad, and well rounded, the profile 

 of the division series and arm bases strongly convex ; the ossicles of the 

 division series and first four brachials which are in close apposition and 

 sharply flattened against their neighbors, have the lateral borders 

 strongly, the proximal and distal borders less strongly, everted, un- 

 modified, finely tubercular, or crenulate, and possess each a narrow 

 blunt median keel; the brachials are rounded dorsally, each usually 

 with a prominent, though low, small rounded median tubercle, which 

 beyond the middle of the arm gradually becomes obsolete; the 10 or 11 

 (only exceptionally more than 10) stout arms are 160 mm. to 180 mm. 

 in length; the IIBr series, when present, are 2; the proximal pinnules 

 are somewhat longer and more slender than their successors; the fol- 

 lowing pinnules are very stout in the basal half, thence tapering gradu- 

 ally to a slender tip, the expansion of the basal segments becoming 

 less and less marked distally; the cirri are about XXX, 15-21 (usually 

 16-19), the component segments slightly constricted centrally with 

 prominent ends. 



Range. — Hawaiian Islands. 



Bathy metrical Range. — From 574 to 812 meters. 



Included Species. — Calyptometra lateralis (A. H. Clark). 



Chondrometra, new genus 



Genotype. — Chlorometra robusta A. H. Clark, 1911. 



Diagnosis. — A genus of Charitometridae in which the 10 arms, from 

 75 mm. to 211 mm. in length, are stout at the base r becoming narrow 

 and strongly compressed laterally in the outer portion ; the mid-dorsal 

 line of each brachial is elevated into a broad, high and blunt overlap- 

 ping spine or tubercle; the ossicles of the division series and the first 

 two brachials, which are in close apposition and are sharply flattened 

 against their neighbors, have the central portion elevated in such a 

 way that their dorsal surface is in the shape of a broadly V-shaped 

 gable; the proximal pinnules are about as long as those succeeding, or 

 at any rate no longer; the genital pinnules are only slightly expanded, 

 the expansion involving a number of segments and tapering away 

 evenly distally; the centrodorsal is large, sharply conical to more or 

 less columnar, the cirrus sockets arranged in one irregular or two 

 regular columns in each radial area; the cirri are XV-XXX, 18-28, 

 stout, varying from short to very long.- 



Range. — Timor to the Meangis and Philippine Islands. 



Bathymetrical Range. — From 520 to 1314 meters. 



Included Species. — Chondrometra rugosa (A. H. Clark), Chondrometra 

 robusta (A. H. Clark), and Chondrometra aculeata (P. H. Carpenter). 



