457 



what prominent, lateral corners narrowly rounded, and not defined posteriorly 

 by any incision or notch. Anterior pairs of coxal plates rather broad, and 

 fully as deep as the body, being densely crowded together; 1st pair some- 

 what expanded in their outer part, with the distal edge broadly rounded; the 

 "1 succeeding pairs oblong quadrangular in form; 4th pair somewhat broader 

 than the preceding pairs, and forming posteriorly, below the emargination, an 

 obtusely truncated expansion; 5th and 6th pairs comparatively small, with 

 the posterior lobe deeper than the anterior, and narrowly truncated at the tip. 

 Epimeral plates of metasome rather large; those of last pair but very little 

 produced at the lateral corners, and having the posterior edge slightly curved. 

 Eyes of moderate size, rounded triangular in form, with well-defined visual 

 elements and light red pigment. Superior antennae extremely slender and 

 elongated, even exceeding somewhat the length of the whole body, 1st joint 

 of the peduncle rather thick, and scarcely longer than the 2nd, last joint 

 about half its length, flagellum about 5 times as long as the peduncle, and 

 extremely narrow and brittle, being composed of numerous articulations 

 carrying slender bristles, accessory appendage forming a single linear joint 

 lying inside the flagellum, and equalling in length about the 1st articulation 

 of the latter. Inferior antennae somewhat less slender than the superior, but 

 of about same length, last joint of the peduncle considerably longer than the 

 penultimate one, both being densely clothed by fascicles of delicate 

 bristles, flagellum rather more than twice the length of the peduncle, and 

 having its proximal part densely setous in a brush-like manner. Anterior 

 gnathopoda with the carpus slightly dilated in the middle, propodos about 

 same length as the latter, and considerably widening distally, palm perfectly 

 transverse, and about half as long as the hind margin, which has several 

 transverse rows of slender setae. Posterior gnathopoda scarcely longer than 

 the anterior, and of a very similar structure, though comparatively 

 somewhat more slender, with the palm scarcely at all expanded, and the 

 propodos considerably narrower. The 3 posterior pairs of pereiopoda some- 

 what robust in structure, with the basal joint oval, and having its posterior edge 

 perfectly smooth, dactylus in all pairs rather large, knife-shaped, and having, 

 at a short distance from the unguiform, curved tip, 2 small denticles. Penulti- 

 mate pair of uropoda reaching considerably beyond the 1st pair; last pair 

 extending about to the tip of the former, and having the outer ramus very 

 small, scarcely attaining l /a of the length of the inner. Telson oval triangular 

 in form, with the edges perfectly smooth, and the tip obtusely pointed. Body 

 pellucid, whitish, more or less distinctly mottled with a light reddish pigment, 

 forming generally narrow bands across the segments, and partly extending 



10 Crustacea. 



