354 DE. W. T. CALMjiN ON NEW OE EAEE 



The pleural plates of the succeedhig somites are not so much expanded laterally as in 

 the female. 



The abdomen is about equal in length to the cephalothoracic region, without teeth 

 or spines on the dorsal surface, but with a lateral groove overhung by a serrated crest 

 on each of the somites; the fifth somite is at least one-half longer than the fourth. 



The antennule has a rather slender peduncle, the first segment about as long as the 

 other two together ; the second segment is produced distally into a narrow process 

 bearing a group of plumose setse ; the inner flagellum is unsegmented and equal in length 

 to the first of the two segments of the outer. 



The flagellum of the antenna extends, in the natural position, at least as far as the 

 penultimate somite of the abdomen. 



The mouth-parts closely resemble tliose of N. unguiculatus, but the palp of the 

 maxillula is relatively a little longer. The third maxilliped has a well-developed 

 exopod and the basis is about half of the total length. 



The first legs have the basis little more than half the combined length of tlie 

 remaining segments ; there are no teeth on the outer margin of the ischium and 

 merus. 



The legs of the last pair are less than one-third of the length of the body ; the 

 basis is about one-fourth of the length of the limb, the carpus nearly four times 

 as long as the merus and nearly one and a half times as long as the propodus ; the 

 dactyl us with its claw is a little longer than the carpus. 



The uropods have the peduncle about two-thirds as long as the last somite. The 

 endopod is about three times as long as the peduncle, with a terminal spine of one- 

 third of its length aiad five spinules on the distal part of the finely serrated inner edge. 

 The exopod is about one-tenth of the length of the endopod and its terminal spine 

 reaches beyond the middle of the latter. 



As in the female, there are some irregular patches of pigment on the side of the 

 carapace and a band encircling the penultimate somite and there are also less distinct 

 and less constant bands on the third and fourth abdominal somites. 



Eemarlcs. — This species is closely allied to N. suhmii G. O. Sars (' Challenger ' Eep. 

 Cumacea (1887), p. 63, pi. x. figs. 4-5). As I have elsewhere mentioned (Herdman's 

 Kep. Ceylon Pearl Eisheries, Royal Soc. pt. ii. (1904) p. 177), the type specimens of that 

 species are now more accessible for examination than when they were described by 

 Prof. Sars, although they are by no means in a good state of preservation. In the 

 female specimen I find no trace of an exopod on the third maxilliped, and I believe that 

 the species agrees with W. zimmeri in this character, Sars's mention of a small exopod on 

 " the second pair of gnathopoda " being based on some misinterpretation of the mounted 

 specimen. The female N. suhmii, however, diff"ers from the species described above in 

 the form of the carapace, which, as shown in Sars's figure, has the branchial regions 

 very strongly inflated and the posterior part of the dorsal surface much more prominent ; 



