194 PROCEEDESTGS OF THE NATIONAL MUSEUM vol. 117 



Albatross-101, sta. 85, 40°34', 68°51', Smith grab, Aug. 23, 1957: 

 1 frag., 1 imm.; Delaware, 59-9, sta. 24, 42°00', 67°49' Smith grab, 

 Aug. 6, 1959: 2 imm. (USFW, R. L. Wigley collection). Sta. 186, 

 40°48', 68°19', Smith grab, 31 fms., Aug. 28, 1957: 1 imm. (NMC 

 7063). 



Description. — Male, 6.5 mm. Head more than twice as wide as 

 long, rostrum short, base broad, apex acute; eyes small, slitlike, just 

 inside border of moderately deep antennal sinus; anterolateral angles 

 of head acute. 



Antenna 1 distinctly shorter than antenna 2 ; peduncular segment 



1 very deep, lateral margin heavily plumose; segment 3 short; flagel- 

 lum of 6 segments, segment 1 largest, calceoli not discernible in 

 present material; sub terminal accessory flagellum of 2 subequal 

 segments. Antenna 2: peduncular segment 4 as deep as long, lobe 

 extending distally, anterior margin with distal rows of short plumose 

 setae; segment 5 short, broad, anterior setae short, fork tipped, 

 flagellum of 5 segments, 1st much the largest, posterior margin 

 plumose. 



Upper lip broad, apex shallow convex, smooth. Lower lip: inner 

 lobes very broad distally, nearly reaching border of broad outer 

 lobes. Mandible incisor simple, conical, lacinia strong, acute, 

 bicuspate on left side, single on right; 3-4 serrate accessory blades; 

 molar process with filelike surface, 1 supramolar blade; palp short, 

 strong, comb row of 10 short spines merging into apical cluster of 

 14 long, slender distally pectinate spines. Maxilla 1: inner plate 

 very small, with 3 simple marginal setae; outer plate narrow, with 

 9 spine teeth; palp strongly arched, broadest in middle, outer margin 

 with plumose setae; accessory lobe lacking (not observed in present 

 material). Maxilla 2: outer plate slightly longer than inner, distal 

 truncate margin with 3 plumose setae, inner margin with about 12 

 slender setae; inner lobe elliptical, facial row of setae straight. Maxil- 

 liped: apex of inner plate narrow, twin spines slender, subequal; 

 outer plate margin smootlily convex, palp segment 2 very broad, 

 apical process large, segment 3 short, strongly arched, broadest 

 distally; setae long, simple. 



Gnathopod 1: coxa shallow, posterior angle broadly rounding, 

 with about 10 plumose setae; segment 2 somewhat arched, setose 

 behind; segment 5 stout, heavily setose below; segment 6 slender, 

 dactyl strong, with subapical ventral spine. Gnathopod 2: coxa 

 lunate, posterior corner sharply rounded, heavily plumose; segment 



2 sublinear, setose behind; segment 5 elongate, lower margin distally 

 with clusters of slender pectinate spines; segment 6 slender sub- 

 cylindrical, moderately arched, dactyl minute. 



