no. 2065. THE CRUSTACEA EUPHAUSIACEA— HANSEN. 91 



somewhat outstanding, collarlike, and at the limit between the side 

 and the upper surface produced as a triangular, flat, very acute 

 process directed forward and outward. The gastric area with a con- 

 spicuous median keel to near its hind margin; this keel continues 

 forward along the rostrum to considerably beyond its middle, while 

 between this keel and the lateral margin the rostrum is hollowed longi- 

 tudinally, and this canaliculation is continued backw ard and outward 

 as a somewhat curved, deeply impressed line limiting the gastric 

 area at the side. The lateral margin of the carapace has no denticle. 



Eyes large, seen from the side (fig. la) subcircular, being slightly 

 higher than broad, feebly narrowing upward, but without any trans- 

 verse constriction. Antennulae in the female (fig. lc) with the two 

 distal peduncular joints differing from those in T. longipes, being 

 distinctly less slender than in that species, and the second joint is a 

 little longer and distinctly thicker than the third. In the male (figs. 

 la and Id) the second joint is still longer in proportion to the third 

 than in the female, both second and third joints are conspicuously 

 thicker and the third somewhat thickened toward the end, while the 

 second has the inner half of its distal upper end produced upward 

 and forward as a broadly rounded lobe, which along its free terminal 

 and upper margin is adorned with setae closely arranged in longitu- 

 dinal rows; these setae constitute a compressed brush, and their ends 

 are curved in a peculiar way; seen from the side the third joint seems 

 to be inserted on the outer side of the second. The antennular flagella 

 are well preserved in an adult male (fig. la) ; the lower flagellum is 

 about as long as the peduncle and much longer than the upper flagel- 

 lum, which is somewhat longer than the sum of the two distal pedun- 

 cular joints. The antennal squama reaches in the female a little 

 beyond, in the male scarcely to, the end of the second joint of the 

 antennulae ; the denticle at the end of the outer margin is well devel- 

 oped. The squama is distally broader than in T. longipes, with the 

 end cut more transversely. 



Maxillulae and maxillae nearly as in the preceding species. Maxilli- 

 peds normal; fig. le exhibits the distal part with its setae. 



First pair of thoracic legs (figs, la and 1/) comparatively feebly 

 elongate, being from a little to considerably longer but conspicuously 

 thicker than the second pair; the fourth joint reaches to or at most a 

 little beyond the end of the first antennular joint. Fifth joint with 

 naked setae along the major part of both margins; sixth joint not 

 much shorter than the fifth, with 7 glabrous setae along the prehensile 

 margin, and these setae are moderately strong and most of them 

 very long; seventh joint longer than deep, with 5 stiff setae and 3 

 among them nearly spiniform. Second pair of legs (fig. 1/) normal; 

 the setae along the lower (posterior) margin very long and distinctly 

 plumose; seventh joint at least twice as long as that of the first pair. 



