NO. 1691. SEVENTEEN NEW SPECIES OF CRINOIDS— CLARK. (547 



siirfju'o of the surrounding skeletal elements; radials concealed; H'r^ 

 usually concealed excei^t in the angles of the calyx; very short; IBro 

 (axillary) triangular, three oi' four times as broad as long; IIT5r 

 •4 (3-|-4) and 2, usually both in the same specimen, but the former 

 always in the majority; IIIBr 2 (1 + 2), or 2 after a IIBr 2 series 

 (rarely, when developed exteriorly, 4 (3 + 4) or 4 (1 + 2; 3 + 4) ), 

 developed interiorly in 1, 2, 2, 1 order, but never present in the full 

 series. The elements of the division series are in close apposition, 

 no water-pores being present. The division series and lower brachials 

 are but slightly convex dorsally, and are in close lateral apposition 

 and sharply flattened. The elements of the IBr series are thickly 

 and evenly covered with prominent tubercles resembling those on the 

 dorsal pole of the centro-dorsal. These sometimes arrange themselves 

 in a more or less linear series in the median line, or there may be a 

 more or less distinct median keel, which, however, is never very well 

 marked. This evenly tubercular ornamentation may encroach some- 

 what upon the lower elements of the IIBr series, and always extends a 

 considerable distance up into the angles of the calyx and between the 

 IIBr series, narrowing to a point anteriorly, as does the somewhat 

 similar ornamentation in Marlanietra suhcarinata. The elements of 

 the IIBr and IIIBr series and the lower brachials have more or less 

 (usually strongly) crenulate or tubercular edges, and the dorsah sur- 

 face usually bears a few small scattered tubercles; along the median 

 line they bear large and prominent, dorso-ventrally elongate, narrow^, 

 dorsally rounded tubercles, which form a conspicuous narrow cari- 

 nation. The lower brachials have very strongly tubercular or dentate 

 distal ends, in the center of Avhich is a single large tubercle, these 

 large tubercles forming a median line of prominent tubercles, which 

 continues the carination of the division series out onto the arms, 

 gradually dying away and disappearing at about the end of the 

 proximal fourth. The prominent eversion of the distal edges of the 

 brachials becomes distally less and less strongly dentate, at the same 

 time becoming less and less erect, until at about the twentieth brachial 

 it becomes merely a moderately marked, finely spinous overlap, and 

 so continues to the ends of the arms. The brachials to about the 

 twentieth are sharply flattened laterally. 



The pinnules are as in other species of the genus. 



Type-specimen. — Cat. No. 25477, U.S.N.M. ; from Albatross sta- 

 tion No. 2753, off the windward coast of St. Vincent; 281 fathoms. 



CRINOMETRA GEMMATA, new species. 



Cirri XX, 12-15, 20 mm. to 25 mm. long. 



Ends of the basal rays visible as elongate tubercles in the angles 

 of the calyx, usually covered with short, fine spines; radials con- 

 cealed, or just visible over the ends of the basal rays; IBr^ very 



