CRUSTACEA MALACOSTRACA. II. IOI 



64. Leptognathia latiremis n. sp. 

 (PI. X, figs. 2 a— 2 n). 



Female (without marsupium) and subadult Male. Somewhat slender, about seven and a 

 half times as long as broad, seen from above sybeylindrieal, but the lateral margins of the thoracic 

 segments considerably convex. — Carapace somewhat shorter than the two following segments com- 

 bined (fig. 2 a), not much longer than broad, subquadrangular but with all angles" broadly rounded. 



Autennulse in the female only a little shorter than the carapace, somewhat varying in thickness 

 (figs. 2 b and 2 c). First joint somewhat longer than the two following joints combined, about two and 

 a half times as long as deep; second joint about half as long as the first and a little produced above; 

 third joint considerably shorter than the second, while fourth joint is conspicuously longer than the 

 second; in a subadult male the three proximal joints (fig. 2d) are considerably thicker in proportion to 

 length and the fourth joint is much longer than the second and only a little shorter than the first. — 

 Antennas with fourth and fifth joints completely fused, about twice as long as the penultimate joint. 



Chelipeds robust (fig. 2g). The basal joint as in L. profunda; ischium extremely broad, em- 

 bracing more than half of the lower margin of the carpus. Carpus extremely deep, less than half as 

 long again as deep. Chela a little longer than the carpus, twice as long as broad; the proximal 

 third of the posterior margin very concave and the major part distinctly convex, with two setae; the 

 fixed finger is peculiarly shaped, the incisive margin to a little from the end being very convex and 

 a little more than the distal half of this portion serrate with some more or less obtuse teeth; the 

 terminal small part of the finger is shaped as an oblong, almost straight tooth; the movable finger 

 is robust, but yet very conspicuously narrower than the proximal half of the fixed finger and consid- 

 erably shorter than the anterior margin of the hand; when the fingers are closed a conspicuous 

 strip of the movable finger is covered by the fixed finger, while at the base there may be seen a 

 minute hole between the fingers; the inner side of the hand bears a long, spiniform seta and a similar 

 seta originates from the inner surface of the movable finger. 



Thoracic segments nearly as in L. profunda. All thoracic legs (figs. 2 h — 2 k) in the main as in 

 L. profunda, but in the anterior pairs fourth and fifth joints are shorter in proportion to thickness, 

 sixth joint much longer than the fifth but slightly shorter than the seventh with claw. 



Abdomen somewhat longer than the two posterior thoracic segments combined (fig. 2 a). Ple- 

 opods (fig. 2I) with the rami well developed though smaller than in L. profunda; each ramus with 

 seta; only on the terminal margin and the setae are shorter than the rami and not plumose; in young 

 specimens with the last pair of thoracic legs still wanting the pleopods are also wanting (fig. 2n). 

 Sixth segment short, shorter than the two preceding segments combined and posteriorly broadly 

 rounded (fig. 2111). — Uropods as long as the sixth segment (figs. 2 m and 2n); peduncle broad but 

 distinctly longer than broad, produced in a triangular plate, which is as long as or longer than the 

 upper margin of the peduncle and its obtuse end bears one long and one short seta; endopod moder- 

 ately robust, without any vestige of a division into two joints. 



Length of the largest specimen from Stat. 58 is 2.5 mm ., of the specimen from Stat. 24 2.8 mra . 



Remarks. This species is distinguished from L.glacialis especially by the shape of the fixed 



