290 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



g*. A large median tubercle or median ridge on the elements of the division series, 

 with small tubercles on the sides. 

 h l . Beyond the IBn only the borders of the elements of the division series carry small 

 tubercles; a larger median tubercle or median ridge always present. 



concinna (p. 298) 



A'. In addition to the small tubercles, and beyond the always present large median 



tubercle, there are larger ones on the elements of the division scries, which give 



the ornamentation a coarser character; there is no eversion of the distal ends; 



dentation occurs only on the proximal border of the axillary, which may be 



crenulate or pleated tuberosa (p. 303) 



p. Proximally recurved liplike distal ends are developed from the first to the fifth brachial 

 and onward; the fifth to eighteenth or twentieth brachials have raised tubercular 

 or almost dentate distal ends and a large knoblike median tubercle; from the ninth 

 to the thirteenth brachials the distal ends are recurved proximally without being 



typically liplike - diadema (p. 308) 



e 1 . Lower brachials with only thickened, usually smooth, more rarely slightly crenulate 

 or tubercular, distal edges which are not produced and turned downward. 

 />. Elements of the division series with strongly everted and more or less tubercular or 

 crenulate margins and an abrupt and conspicuous median ridge; cirrus segments 



usually short, the longest half again as long as broad transversa (p. 301) 



P. Elements of the division series without prominently everted edges, with granular 



or beadlike ornamentation often confined to the edges; cirrus segments usually 



longer, the longest twice as long as broad. 



g 1 . Dorsal surface of the elements of the division series smooth, the lateral borders 



only slightly tubercular; a row of small beadlike tubercles on the proximal border 



of the IBn and IBr axillary; IIBr 2. 



hK Elements of the IBr series with an elevated midline and a sharp median ridge. 



brevipirma (p. 312) 

 h*. Elements of the division series almost flat, with a low broad median swelling; 



no median ridge - ..pourtalesi (p. 309) 



p*. Dorsal surface of the elements of the division series with more or fewer more or less 

 flattened granules or small tubercles. 

 fc 1 . Dorsal surface of the division series with more or fewer large and more or less 

 flattened granules that become smaller and higher on the lower brachials; 

 usually a low and narrow median ridge. 



t 1 . IIBr 2 - ..granulosa (p. 325) 



i». IIBr 4(3 + 4) ..granulifera (p. 326) 



h*. Dorsal surface of the division series evenly studded with more or less uniform 

 moderately large rounded or blunt tubercles which become gradually less marked 

 after the second brachial and disappear altogether at about the end of the 

 proximal fourth of the arm; elements of the IIBr and IIIBr series and first two 

 brachials with a low but prominent median carination continued on to the arms 

 in the shape of a prominent median tubercle on each brachial which disappears 



at about the end of the proximal fourth of the arm margaritacea (p. 307) 



<P. Arms from the third brachial outward entirely smooth, the brachials without thickened 

 distal edges; on the IBr axillary and the elements of the IIBr series the median ridge is 

 sharply produced, resulting in an angular sharpening of the dorsal surface, .laevis (p. 311) 

 6*. Ornamentation consisting of sharp pointed spines or teeth. 



c 1 . Ornamentation of the lower brachials and that of the division series equally well developed; 

 the whole surface of the division series and lower brachials as far as the tenth or twelfth 

 rather thickly and fairly evenly beset with spines or teeth. 



tf. IIBr 4(3 + 4) ...gemmata (p. 318) 



cP. IIBr 2 spinosa (p. 316) 



r 1 . Ornamentation of the arm bases qualitatively and quantitatively more strongly developed 

 than that of the division series. 



