144 



usual manner, and together they are subequal in length to 

 the ischium. 



In the second gnathopods the basis and ischium are sub- 

 equal in length, the merus a little longer than the carpus, 

 the propodus longer than the carpus. The spines on this 

 limb and three following pairs are mostly replaced by furry 

 pads. 



The first pleopod has the inner margin of the endopod 

 folded at right angles to the other part, as shown in the 

 figure. In the second pleopod the appendix masculina 

 reaches farther than the fringe of the endopod, and there is 

 also a less pronounced fold on the inner margin. The proxi- 

 mal end of the appendix is bent down quite to the base of 

 the peduncle, as is seen in C . lafreillii. The exopod of the 

 third pleopods has a division ; its endopod has some curious 

 minute crowded teeth on the inner margin ; its external 

 distal angle is abrupt. The exopod of the fifth pleopods has 

 six denticulate lobes, four of which are on the distal divi- 

 sion. 



The two sternal filaments are long. 



The uropods have the internal ramus much reduced; the 

 outer ramus is strong, rounded externally, flattened intern- 

 ally, curved, and slightly bifid at the end, projecting well 

 beyond the dorsal process. 



The female differs considerably from the male; in it 

 the anterior portion of the pleon has two short median longi- 

 tudinal ridges, but no large projection. The posterior por- 

 tion has, besides the two large conical projections, two small 

 tubercles a short distance above each. The posterior notch 

 is deeper than in the male, and has a roofing projection 

 more or less tridentate at its apex. 



The inner ramus of the uropod is bifid at its apex ; the 

 outer ramus also is bifid, with an external projection, and 

 an inferior keel terminating abruptly short of the bifid end. 

 The inner uropod is channelled to receive part of the outer 

 one when folded. 



Sometimes none of the ambulatory legs are padded. 



In the specimen examined the marsupial plates were well 

 developed and overlapping; the mouth parts were modified, 

 although the external appearance of the mandibles closely 

 resembled those of the male. 



A young female, which I take to be a variety of this 

 species, has the following distinctions : — The posterior seg- 

 ments of the thorax are narrower, and all are more or less 

 provided with small tubercles arranged transversely. The 

 two ridges on the anterior part of the pleon are more con- 

 verging behind. There are more small tubercles above the 



