CRUSTACEA MALACOSTRACA. II. 123 



Chelipeds moderately strong (fig. 30). Basal joint short, somewhat deeper than long, without 

 any posterior protuberance, as its whole posterior margin is oblique and inserted on a very large, 

 well defined coxal area; the hind margin of the joint is very remote from the front lower end of se- 

 cond thoracic segment. Carpus twice or more than twice as long as deep, peculiarly shaped; the 

 lower margin has a very low protuberance with two small setae at the middle and behind and beyond 

 this protuberance the margin is feebly concave; the upper proximal part of the joint is somewhat 

 produced backwards. Chela somewhat longer than the carpus and a little more than twice as long 

 as broad; the movable finger somewhat robust, as long as or slightly longer than the anterior margin 

 of the hand, which is conspicuously but more or less irregularly arcuate; the posterior margin of the 

 chela is sinuate, showing three concave or flatly incised places (figs. 3b and 3! - - the last figure 

 drawn from a subadult male); the incisive margin of the fixed finger has a sharp tooth somewhat 

 from the end. 



Thoracic segments, seen from above (fig. 33), peculiarly shaped and increasing somewhat in 

 length from the second to the sixth. Second segment, which is slightly narrower than the carapace, 

 is considerably broader anteriorly than behind, with the lateral margins converging considerably back- 

 wards. Third to seventh segment on each lateral margin with a rounded protuberance, which on the 

 third segment is situated somewhat before the middle, on the following segments gradually more 

 backwards; the front half of each lateral margin of the three posterior segments is conspicuously 

 convex. In specimens without marsupium (fig. 3b) each segment has on the ventral side a moderately 

 long, slender, acute process; on second segment this process is situated near the front end, on the 

 following segments gradually more backwards, on seventh segment (fig. 3h) somewhat or a little be- 

 fore the middle; the anterior processes (fig. 3b) are curved much forwards, while on the posterior seg- 

 ments they are directed more downwards (fig. 3h); in females with marsupium the processes of second 

 to sixth segments are lost, but the process on seventh segment is preserved. -- Thoracic legs (figs. 3 b 

 and 3g) rather slender, decreasing in length from second pair, which are somewhat long, to seventh 

 pair, which are somewhat short; most of the spines on the legs are somewhat long. Second pair 

 with fourth and fifth joints rather long, sixth joint somewhat longer than the fifth and about as long 

 as seventh joint with claw; the spine on the anterior angle of fifth joint long. Seventh pair (fig. 3g) 

 with sixth joint a little or slightly shorter than fifth joint and somewhat shorter than seventh joint 

 together with the fine, curved claw. 



Abdomen very short. Five anterior segments, when straightened (fig. 3!), together a little or 

 somewhat shorter and much narrower than seventh thoracic segment Sixth segment, seen from above 

 (fig. 3i), a little longer than the three preceding segments combined, much broader than long and 

 somewhat broader than the fifth segment, posteriorly at the middle distinctly triangularly produced; 

 the lateral margins very convex. - Uropods about as long as, or a little longer than, sixth segment, 

 robust; exopod not marked off and directed essentially downwards (fig. 3!!), being an oblong, triangular 

 protuberance from the distal angle of the peduncle and longer than the peduncle itself, which is at 

 least as long as deep ; endopod two-jointed, with the first joint distinctly shorter than the second. 



Length of a large female without marsupium 2.9 min , of females with marsupium 2.6 2.8 ram . 



Subadult Male. It differs from full-grown females without marsupium in three features 



16* 



