149 



liowever, a much wider gap between these than between any 

 of the other side expansions, the ends of the two uropods 

 excepted. The margins of all the expansions have a dense 

 membrane-like fringe, with projecting hairs. The head and 

 all the segments of the thorax do not differ much in length. 

 The epimera of all except the first are separated by distinct 

 sutures from their respective segments, and project nearly 

 in the same curve as the segments. 



The anterior portion of the pleon is short, marked with 

 the usual lines, which do not extend on to the lateral plates, 

 showing probaialy that only the more anterior segment bears 

 the expansion. The posterior portion of the pleon is convex, 

 and has anteriorly a median low convexity : it tapers quickly 

 to a narrow rounded end, which is without notch, being only 

 channelled below in the faintest manner; the sides and ends 

 are thin. 



The third joint of the antennule is of the usual size, 

 the flagellum short, with 8 or 9 joints. 



The epistome is arcuate and very distinct, without an 

 anterior prolongation. The upper lip is large. 



In the mandibles the molar is much reduced; on the 

 left mandible the spine row and secondary plate are not dis- 

 tinctly differentiated; in the right the spines also are 

 coalesced. The incisory plates of both are well developed and 

 dentate. In the male the mandibles are normal. 



The maxillipeds have the lobes of the joints of the palp 

 short, especially that of the penultimate, which is subequal 

 in length to the last. The setae are rather scanty. 



The legs are in a simple series, and all are similar — 

 except the first gnathopods — and do not dift'er much in size. 

 The carpus of each, except the first, has an insinuation on 

 one side; all are nearly spineless. The dactyli are short, 

 but the principal claw is rather long and acute. 



The endopod of the first pleopods is much longer than 

 broad; it has a ridge, or shelf, on which the inner margin 

 of the exopod lies. The exopod of the third pleopod is 

 ovate, and is without division; the endopod is much longer 

 than broad. In the male the rami of the fourth pleopod3 

 are very thin, but both are well marked with branchial folds. 

 The exopod of the fifth pleopods has a division and two lobes 

 on the distal portion, and two at the inner distal angle of 

 the proximal part opposite each other on each side. There 

 are no small setae on the external margin of this ramus. 



In the uropods the peduncle and endopod are fused, and 

 the exopod occupies a notch in the side. The end of the 

 ■endopod slightly exceeds the end of the pleon. 



