32 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



nule may be slightly carinate basally, and after the second or third 

 joint the distal dorsal ends of the joints become thickened and project 

 strongly, forming "lateral processes," as in Amphimetra vanipinna; 

 Pg slightly stouter aiid slightly longer than Pj, usually with a few 

 less joints, but similar to it; P^ 9 mm. long, comparatively slender, 

 without lateral processes; the joints becoming squarish on the fourth 

 or fifth and about twice as long as broad terminally ; following simi- 

 lar, gradually increasing to 10 mm. in length and then becoming more 

 slender and slowly decreasing to 8 mm. in length. 



Color (in spirits). — White, the cirrus joints with purple saddle- 

 shaped markings in the distal half or two-thirds of the cirri. 



Type-specimen. — Cat. No. 25510, U.S.N.M., from Alhatross station 

 5157, west of Sunalac Island (Tataan group, Philippine Archi- 

 pelago) ; 18 fathoms. 



Genus AMPHIMETRA A. H. Clark. 



AMPHIMETRA PARILIS, new species. 



Centro-dorsal thick-discoidal, the bare polar area flat, 2.5 mm. in 

 diameter ; cirrus sockets arranged in one and a partial second crowded 

 marginal row. 



Cirri XII, 30-33, 25 to 30 mm. long, moderately stout; joints sub- 

 equal, all broader than long, at first very short, then slowly increasing 

 to the seventh or eighth, which, with the three or four following, is 

 about half again as broad as long, then very slowly decreasing, so 

 that the joints in the distal half of the cirri are about twice as broad 

 as long; twelfth and following joints with prominent median dorsal 

 spines, which are directed anteriorly; opposing spine longer than the 

 spines on the preceding joints, sharp, triangular, rather slencler, the 

 apex median, rising to a height about equal to half the diameter 

 of the penultimate joint; terminal claw longer than the penultimate 

 joint, slender, more strongl}^ curved proximally than distally. 



Radials ju.st visible in the median line, forming a low triangle in 

 the angles of the calyx, the lateral corners slightly swollen ; IBrj^ ob- 

 long, four times as broad as long, almost entirely united laterally; 

 IBr. (axillary) almost or quite triangular, somewhat over twice as 

 broad as long, in apposition and laterally flattened. 



Ten arms 150 mm. long, tapering rather less rapidly than in .1. dln- 

 eoidea and .1. formosa; first two brachials short, wedge-shaped, the 

 second slightly the longer exteriorly, but tapering almost to a point in- 

 teriorly, the first entirely united interiorly; third and fourth brachials 

 (syzygial pair) oblong, two and one-half or three times as broad as 

 long; next seven or eight brachials oblong, very short, about four 

 times as broad as long or even shorter, then becoming wedge-shaped, 

 about the same length, and in the di.stal half of the arm oblong and 

 very short. In the proximal third of the arm the proximal edge of 



