﻿CRl'STACIvA MAI.ACOSTkACA. 11. 



123 



Chelipeds UKxleratt-ly slrong (fig. 3b). Basal joint sliort, soiuewliat deepor tliau long, witiiout 

 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 set^e at tlie middle and behind and beyond 

 this protuberance the margin is feebly concave; the upper proximal ])art of the joint is somewhat 

 produced backward.s. 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 flath- incised places (fig.s. 3 b and 3I — the last figure 

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

 from the end. 



Thoracic segments, seen from above (fig. 3 a), peculiarly shaped and increasing somewhat in 

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

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

 wards. Third to seventh segment on each lateral margin \\ith 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 

 con\-ex. In specimens without marsupium (fig. 3b) each segment has on the ventral side a modcrateK' 

 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 (fig.s. 3 b 

 and 3 g) 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 

 w'ith 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. vSt-veuth pair (fig. t,o;) 

 with sixth joint a little or slightly shorter than fifth joint and somewhat shorter than SL-veuth joint 

 together with the fine, curved claw. 



Abdomen very short. Five anterior .segments, when straightened (fig. 3i), 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, posteriorl\- at the middle distincth' triangularly produced; 

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

 robust; exopod not marked off aiul directed essentiallv downwards (fig. 311). being an oblong, triangular 

 protuberance from the distal angle of the peduncle and longer than the ]ieduncle it.self, which is at 

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



Length of a large female without marsupium _>.9 , of females with marsupium 2.6—2.8""". 



vSubadult .Male, ll differs from full-grown females without uiarsui)iuni in three features 



