88 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 48. 



Sta. 4802. June 24, 1906. Lat. 46° 44' N.; long. 151° 44' E. 1 

 specimen. 



Sta. 5030. September 29, 1906. Lat. 46° 29' 40" N.; long. 145° 

 46 ' E. 300-0 fathoms. Large number of specimens. 



Description. — Rostrum long, rather narrow, distally acuminate 

 (fig. lb), slightly more slender in the male than in the female. The 

 most anterior part of the carapace both above and on each side con- 

 spicuously protruding and curved somewhat outward as a kind of 

 collar, most protruding at the limit between the side and the upper 

 surface, and its margin at that limit forming a rounded or subacute 

 angle. The major anterior part of the gastric area (fig. lb) has a 

 well-developed median keel which also runs along the rostrum to 

 near the apex; between this keel and each lateral margin the rostrum 

 is hollowed longitudinally, and this excavation is continued back- 

 wards and outwards as a deep, straight impression, the anterior part 

 of which constitutes the limit between the gastric area and the collar- 

 like produced anterolateral portion of the carapace. The lateral 

 margin of the carapace has a distinct denticle somewhat behind the 

 middle. 



Eyes large (figs, la-lb), with a conspicuous transverse constriction 

 considerably above the middle, and the upper section is much nar- 

 rower and lower than the inferior section. Antennulse in the female 

 (pi. 2, fig. la; pi. 1, fig. 3a) with the two distal peduncular joints 

 long and slender, the third joint conspicuously more slender and a 

 little longer than the second; in the male (pi. 1, fig. 3b) both 

 joints are conspicuously shorter and thicker, the third joint scarcely 

 or slightly longer and a little thinner than the second. Antennular 

 flagella (fig. la) in both sexes thin with many joints and the upper 

 flagellum slightly shorter than the lower; in the female the flagella 

 are somewhat longer than the sum of the two distal peduncular joints; 

 in the male they are proportionately a little longer than in the 

 female. Antennal squama (pi. 2, fig. lb) somewhat narrow, with a 

 tooth on the outer distal angle; the squama reaches in the female to 

 the middle, in the male beyond the middle, of the third antennular 

 joint. 



MaxiHulse nearly as in T. gregaria (compare Sars, 1885) ; maxillae a 

 little longer in proportion to breadth than in T. gregaria. Maxillipeds 

 normal, in the main as in T. gregaria; the distal part with its seta3 is 

 shown in plate 1, fig. 3c. 



First pair of thoracic legs (pi. 2, fig. la) very elongate, with the 

 fourth joint reaching beyond the end of the antennular peduncles. 

 These legs are strong, and especially the third joint and the proximal 

 half of the fourth joint are very robust, much thickened; fifth joint 

 somewhat arcuate with some few setae along the distal part of both 

 margins; sixth joint somewhat long, about two-fifths as long as the 



