546 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



The pinnules are of the type common to most of the species of the 

 genus, but are somewhat more slender, the genital pinnules not being 

 so much expanded. 



Type-specimem. — Cat. No. 25-172, U.S.N.M. ; from Albatross Sta- 

 tion No. 2154, off Havana, Cuba; 310 fathoms. 



CRINO^ETRA CONCINNA, new species. 



Cirri XX, 14-18 (usually 15 or 16) 25 mm. to 30 mm. long. 



Ends of the basal rays visible in the angles of the calyx, bearing 

 one or more long tubercles; radials concealed; IBr^ very short 

 often more or less concealed by the centro-dorsal, curved and band- 

 like or narrowly crescentic; IBr. (axillary) rhombic tci approxi- 

 mately triangular, two and one-half times as broad as long, the 

 lateral edges as long as those of the IBr^, and often, like them, re- 

 duced to a point ; IIBr 2 (once 4 (3 -)- 4) and twice 4 united in two 

 synarthrial pairs in eight sj^ecimens) ; IIBr 2, developed interiorly; 

 edges of the joints to the third brachial everted and raised, usually 

 broken up into high blunt tubercles which intermingle more or less 

 with similar high blunt, more or less confluent tubercles on the dorsal 

 surface of the joints; division series (except the IBr) and first two 

 brachials usually with a high, rather narrow, median ridge, higher 

 than the tubercles on the dorsal surface of the joint ; this is sometimes 

 i:)artially or entii^ely broken up into two or three dorso-ventrally 

 elongate tubercles, larger than any of the others on the joints. The 

 proximal edge of the axillaries and the inner proximal edge of the 

 second brachial are curved upward, while the distal lateral angles 

 of the joints preceding the axillaries, and the inner distal angle of 

 the first brachials, are cut away, leaving prominent openings, which 

 serve as water pores. The division series are only very slightly 

 convex dorsally, and are in very close lateral apposition; the first 

 sixteen brachials are flattened laterally. 



Thirty arms 150 mm. long, resembling those of other species of 

 the genus; the lower brachials to about the fifteenth have strongly 

 everted distal ends, which are usually more or less crenulate, or may 

 be tubercular; there is usually a prominent central tubercle, dorso- 

 ventrally elongate, and also some more or less obsolete tubercles on 

 the dorsal surface; from the fifteenth onward the brachials are 

 almost perfectly smooth dorsally. 



Type-speciinen. — Cat. No. 25476, U.S.N.M.; from Albatross station 

 No. 2342, off Havana, Cuba ; 201 fathoms. 



CRINOMETRA INSCULPTA, new species. 



Cirri XX, 15-18, 25 mm. to 30 mm. long. 



Ends of the basal rays visible in the interradial angles as a cluster 

 of high tubercles, with difficulty separable from the similarly modified 



