1898-1902. No. 18.] CRUSTACEA. 33 



ones combined and evenly rounded in front, rostral projection very 

 slight, almost obsolete. Urosome nearly as long as the anterior 

 division, segments finely spinulose at the hind edge ventrally and late- 

 rally, last segment almost as long as the preceding one, but somewhat 

 narrower, anal opercle perfectly smooth. Caudal rami comparatively 

 short and obliquely oval in form, with the outer edge very convex, 

 almost angular in the middle, the inner nearly straight, tip obtusely 

 rounded, dorsal face with a slight carina running along the proximal 

 part as far as the small dorsal seta, and followed by a row of 4 rather 

 strong denticles extending to the inner corner; outermost apical seta 

 attached at some distance from the other three, apparently to the 

 outer edge, seta of this edge attached considerably in front of the 

 middle; outer medial seta somewhat bent outwards at the base, and 

 about half as long as the inner, which about equals in length the uro- 

 some and last pedigerous segment combined. Anterior antennae rather 

 slender, though not attaining the length of the cephalic segment, 8-arti- 

 culate, and only sparingly setiferous, terminal part about the length of 

 the proximal one. Posterior antennae and oral parts exhibiting the 

 structure characteristic of the genus. 1st pair of legs moderately slender, 

 outer ramus a little longer than the 1st joint of the inner, its last joint 

 exceeding in length the middle one, and carrying on the tip 2 slender 

 spines and 2 geniculate setae; inner ramus with the 1st joint a little 

 longer than the outer 2 combined, and having inside, at a short distance 

 from the end, a comparatively short seta, last joint more than twice as 

 long as the preceding one, sub-linear in form, and carrying on the tip 

 a slender claw and a long seta. Natatory legs with the rami less 

 slender than in the type species, but otherwise of a very similar struc- 

 ture. Last pair of legs with the distal joint comparatively small, oval 

 in form, and armed with 5 marginal setae, one of which, issuing from 

 the tip, is very thin, hair-like, the others rather coarse and spinulose at 

 the edges; inner expansion of proximal joint rather large, lamellar, ex- 

 tending almost as far as the distal joint, and broadly rounded at the end, 

 which carries 6 coarse spinulose setae of somewhat unequal length. 



Male with the anterior antennae hinged in the usual manner. Inner 

 ramus of 2nd pair of legs with the 2 outer joints wholly coalesced ; that 

 of 3rd pair very conspicuously transformed, 3-articulate, 1st joint short, 

 projecting outside in an acute corner and carrying inside a small bristle; 

 2nd joint likewise short, but produced inside to a long deflexed process 

 terminating in a thin setiform point; last joint, oblong fusiform in shape, 

 and carrying on the tip 2 slender setaa of unequal length. Last pair of 



