516: BULLETIN 82, UNITED STATES NATIONAL MXJSETJM 



Description. — The centrodorsal is rather large, thick discoidal, with the bare 

 polar area flat, 5 mm. in diameter. The cirrus sockets are arranged in a marginal row 

 with a more or less complete second row alternating with it. 



The cirri are XXV, 22-30 (usually about 25), from 20 to 30 mm. (mostly about 

 25 mm.) in length, moderately stout and of uniform size throughout. The first seg- 

 ment is about twice as broad as long, the fourth is about as long as broad, the fifth- 

 eighth or -ninth are about as long as broad or slightly longer than broad, and the 

 remainder are about one-third again as broad as long. The sixth and following seg- 

 ments have the distal dorsal edge produced into a low serrate transverse ridge which 

 moves proximally on the succeeding segments, soon attaining a median position and 

 appearing as a small spine in lateral view and a serrate crescentic or flattened ridge in 

 end view. The opposing spine is a short transversely linear median ridge which is 

 about as high as the ridge on the preceding segment and is straight or slightly concave 

 in profile. The terminal claw is stout, moderately curved, about equal to the penul- 

 timate segment in length. 



The ends of the basal rays are just visible as very small tubercles in the inter- 

 radial angles of the calyx. 



The radials are just visible over the ends of the basal rays in the angles of the 

 calyx. The IBri are very short and bandlike, united in the proximal two-thirds but 

 widely diverging distally. The IBrj (axillaries) are very broadly pentagonal or 

 almost triangular, twice as broad as long, mdely separated laterally. The IIBr 

 series are 4 (3 + 4) (in the type specimen two of them are 2). The IIIBr series are 2 

 (in the type specimen 2 of the 8 are 4 [3 + 4]). The first ossicles following each axil- 

 lary are almost entirely united interiorly. The division series are strongly rounded 

 dorsally and laterally and entirely free laterally. 



The arms are about 30 ia number, 90 mm. long. The first 2 brachials are sub- 

 equal, slightly wedge-shaped, twice as broad as long. The first syzygial pair (com- 

 posed of brachials 3+4) is oblong, from half again to twice as broad as long. The 

 next 2 or 3 brachials are approximately oblong, twice as broad as long, and those 

 foflowing become nearly or quite triangular, not quite so long as broad, and in the 

 distal half of the arm wedge-shaped, twice as broad as long, and shghtly longer 

 terminally. The elements of the division series and all the brachials have strongly 

 produced distal ends. 



Syzygies occur between brachials 3 + 4, again in the vicmity of the eleventh or 

 twelfth brachial, and distally at intervals of usually 4 muscular articulations. 



The disk is 15 mm. in diameter and naked. The mouth is radial and marginal. 

 The anal area is very large. The anal tube is central. 



Pd is about 16 mm. long, comparatively slender and but little enlarged basally. 

 The terminal comb is short, with 6 or 7 moderately large rounded triangular teeth. 

 Pp is similar, nearly as long, and only slightly less stout basally. Pi is similar to Pp. 

 Pj and P3 are very small and weak, only 5 mm. long. P4 and the following pinnules 

 are about 7 mm. long, stouter than P3 and bearing long gonads. The distal pinnules 

 are slender, about 9 mm. long. All the pinnules have the basal segments with rather 

 promment finely spinous distal ends, especially on the dorsal side. 



The color in alcohol is brownish yellow, the division series and arm bases with a 

 broad dark lateral line, the cirri lighter with occasional dark bands. 



