CRUSTACEA MALACOSTRACA. II. 43 



to seventh segment (fig. 33). Second segment about twice as broad as long, with the lateral margins 

 distinctly convex and besides converging from somewhat behind the anterior to the posterior end ; 

 the segment is below and a little behind the front end produced in a very strong, oblique-triangular, 

 acute process directed downwards and much forwards (fig. 3c). Third segment about half as long 

 again as the second, broadest not much behind the anterior margin, but the lateral angles somewhat 

 rounded, and from these angles the margins converge considerably to the hind margin; fourth seg- 

 ment nearly as the third, but the rounded lateral angles are nearer to the middle of the segment; 

 fifth segment as long as broad, with the lateral margins nearly regularly convex. The two posterior 

 segments increase almost gradually in breadth to somewhat behind the middle and the posterior part 

 of their lateral margins is convex, thus converging near the hind margin, which is longer than the 

 front margin of the same segment. - Thoracic legs slender. Second pair long (fig. 3c); fourth joint 

 with a long seta from the anterior distal angle; fifth joint with two long setae from the corresponding 

 angle; sixth joint only somewhat longer than the fifth, with the setae somewhat short; seventh joint 

 with claw scarcely as long as fifth joint Third pair somewhat shorter than the second; fifth joint 

 with a long seta from the anterior distal angle; sixth joint as long as the fifth plus half of the 

 fourth, with its distal anterior seta extremely long; seventh joint with claw less than half as long 

 as sixth joint. Fourth pair in the main as the third. Three posterior pairs subsimilar, moderately 

 long, slender (fig. 36); second joint more than four times as long as broad; fourth joint not expanded, 

 without spines, fifth joint (fig. 3 f) with a small spine on the outer side of the end, while the joint 

 is distally on the anterior side produced into a peculiar, short, broad, subtriangular, acute process 

 directed forwards; sixth joint moderately strong, scarcely widened towards the end. a little longer than 

 fifth joint and with a small spine on the anterior side a little before the end; seventh joint with claw 

 distinctly less than half as long as sixth joint 



Abdomen a little longer than the two posterior thoracic segments combined and as broad as 

 the second segment. - Uropods moderately short (fig. 3g); endopod two-jointed, with first joint con- 

 spicuously longer than the second; exopod scarcely reaching the middle of second joint of the endopod, 

 without any perceptible division into two joints. 



Length 2.45 mm . 



Subadult Male. It differs from the female in having the antennulse (fig. 3h) much thicker; 

 first joint is not four times as long as deep and with nearly the same depth from base to end; the 

 two other joints combined as long as first joint; second joint is proportionately thick, though some- 

 what longer than deep; third joint is conspicuously thicker than in the female and with the proximal 

 third a little thickened below. 



Remarks. T. mucronatus is especially distinguished by the long antennulse with the third 

 joint very long and in the female extremely thin, by the large ventral process on second thoracic seg- 

 ment, by the long setae on some joints of the anterior pairs of thoracic legs, and by the peculiar pro- 

 cess 011 fifth joint of the posterior pairs; furthermore the thoracic segments, seen from above, differ 

 markedly from most other species. 



6* 



