240 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



arranged in 10 columns of 3 or 4 each. These columns are closely crowded against each 

 other interradially but in the midradial line they are separated by a V-shaped area, more 

 or less irregular, which at the rim of the centrodorsal varies from as broad as the 

 adjacent cirrus sockets to only half that width. 



The cirri are about XXXV, 18-19, very stout, about 30 mm. long. The first 

 segment is extremely short, and the second is usually about twice as broad as long, 

 though it may be broader, or when the cirri are closely crowded it may be as long as 

 broad. The segments following increase in length so that the sixth is about as long as 

 broad. The next two are slightly longer than broad, and those succeeding are shorter 

 again, in the distal third of the cirri being from one-third to one-half again as broad 

 as long. The antepenultimate segment is slightly less in width than the segments 

 preceding, and varies from about one-third again as long as broad to as long as broad. 

 The last six to eight segments before the antepenultimate have the distal end dorsally 

 extending somewhat beyond the base of the succeeding segment, which in lateral view 

 is usually more or less rounded off, and the dorsal midlino of these segments is obscurely 

 carinate. The opposing spine is small, conical, terminal, and directed obliquely forward. 

 The terminal claw is about as long as the penultimate segment, rather stout, and moder- 

 ately and evenly curved. 



The ends of the basal rays are visible as large irregular tubercles in the interradial 

 angles. 



The radials are visible as usually large triangles, broader than high, that extend 

 downward between the topmost cirrus sockets in the free midradial triangles on the 

 centrodorsal; touching the basal angles of these radial triangles there are long usually 

 more or less lenticular tubercles extending diagonally forward between the ends of 

 the basal rays and the lateral borders of the IBri ; rarely these are reduced to more or 

 less circular conspicuous capitate tubercles. The IBri are very short, with the lateral 

 borders very strongly diagonal or divergent, as a result of the presence of the long 

 tubercles representing the anterolateral portion of the radials, and with the distal 

 border more or less strongly concave. The median third of the dorsal surface is raised 

 into a broadly rounded prominence. The IBr 2 (axillaries) are twice as broad as long, 

 or even broader, triangular or more or less rhombic, with most or all of the median 

 portion raised and broadly rounded, corresponding to the raised center of the IBri. 

 The IIBr series are 4(3+4), all 10 being present and similar. They are very closely 

 appressed laterally and are sharply flattened against each other. The profiles of the 

 division series and arm bases on opposite sides make an angle of 45 with each other. 

 The lateral borders of the elements of the IIBr series are abruptly everted, especially 

 interradially. This eversion is greatest on the IIBri, less on the IIBr 2 , and is scarcely 

 noticeable on the two outer segments. A prominent rounded carination occupies the 

 midline of the IIBrj and IIBr 2 , and is represented in much reduced form on the syzygial 

 pair. 



The 20 arms are 160 mm. long. The earlier brachials have broad, low, and incon- 

 spicuous median tubercles which are continued distally as a barely traceable carination 

 that is absent from some arms. 



A small specimen from the same station has 10 arms 90 mm. long. The cirri are 

 15 mm. long with 13-14 segments. The ends of the basal rays are very large, and the 

 radials, which are nearly half as long as the IBri, are more or less crescentic, their lateral 



