CRUSTACEA CASJIA. 279 



marked transverse sulcus dorsally. Ceplialou comparatively small, with the 

 lateral lobes evenijr rounded. Anterior pairs of coxal plates rather large, 

 fully twice as deep as the corresponding segments, and fringed distally with 

 moderately long bristles; 1st pair considerably expanded in their outer part; 

 4th pair very large, deeper than they are broad. Last pair of epimeral plates of 

 metasome about as in the preceding species. Urosome of moderate size; 2nd 

 segment with a single small spinule dorsally; 3rd segment with 2 spicules 

 on each side of the dorsal face. Eyes well developed, oval reniform. Antennae 

 short, subequal in length, the superior ones with the 2nd joint of the ped- 

 uncle rather elongated, flagellum extremely small, accessory appendage 4- 

 articulate. Inferior antennre with the tiagellum very small, not even attain- 

 ing the length of the last peduncular joint. Gnathopoda very powerfully 

 developed and rather unequal in size, propodos in both pairs large and 

 broad at the base, obpyriforra, with the palm very oblique and much longer 

 than the hind margin, being defined below, in the posterior pair, by a distinct 

 projecting angle armed with a strong spine. Pereiopoda nearly of the same 

 structure as in N. corpulcnius. Last pair of uropoda comparatively more 

 fully developed than in the 2 preceding species, outer ramus sublamellar 

 and densely fringed with ciliated setfe, inner ramus scale-like, having inside 

 a row of ciliated bristles, and terminating with 2 small spines, lelson with 

 eacli of the lateral lialves armed at the obtusely truncated tip with 4 spines. 

 Length of adult male 1 7 mm. 



Bemarks. — This new species is at once distinguished by its unusually 

 stout and compact body, and by the distinct transverse sulci crossing the 

 dorsal face of some of the segments. Moreover the structure of the antennae 

 and especially that of the gnathopoda may serve to easily recognize the 

 species. I have only seen a single specimen, and for this reason have not 

 been able to examine the oral parts. But there cannot be any doubt that it 

 is congeneric with the 2 preceding species. 



Description of the male. — Tlie length of the specimen examined measures 

 17 mm., and this form accordingly grows to a much larger size than any of 

 the other known species of the present genus. 



The form of the body (see fig. 14) is extremely robust and compact, 

 more so indeed than in any of the other species. The back is very broad 

 and has across each of the 2 posterior segments of the mesosome and those 

 of the metasome a very conspicuous transverse depression or sulcus. 



The cephalon is comparatively small, scarcely longer than the 1st seg- 

 ment of the mesosome, and its lateral parts are partly concealed by the 

 largely developed 1st pair of coxal plates. The lateral lobes are somewJiat 

 projecting and quite evenly rounded at the tip. 



^113. -Max. CTp. 187. 5 



