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part, upper contour nearl}' straight and horizontal, rostrum of soirewhat 

 unusual form, having its outer part abruptly clefiexecl and obtusely rounded 

 at the tip, which does not extend to the end of the basal joint of the 

 superior antennae, lateral lobes of cephalon broadly rounded, and separated 

 from the rostrum by a rather wide sinus. The 3 anterior pairs of coxal 

 plates fully as deep as the corresponding segments, and somewliat widening 

 distally, 1st pair obtusely truncated at the tip. the 2 succeeding pairs having 

 the anterior corner produced to an acute point; 4th pair somewhat less deep, 

 and narrowly rounded at the tip, posterior edge deeply emarginated in its 

 upper part, and produced below the emargination to an acuminate projection; 

 tlie 2 succeeding pairs much broader than they are deep, posterior lobe an- 

 gular below. First pair of ejiimeral plates of metasome evenly rounded, the 

 2 succeeding pairs each produced at the lateral corners to an acute recurved 

 point, that of last pair being much the larger and spiniform, posterior edge 

 of all the plates simple, without any angular projections or denticles. Eyes 

 replaced by an irregular patch of a chalky white pigment, only visible in 

 living specimens. Superior antennae in female scarcely exceeding in length 

 V* of the body, 1st joint of the peduncle but little longer than the 2nd, though 

 much broader and somewhat bent in the middle, flagellum scarcely attaining 

 the length of the peduncle, and composed of S articulations, accessory appen- 

 dage small, biarticulate. Same antennae in male scai'cely longer than in fe- 

 male, but having the 1st joint of the flagellum very large and densely clothed 

 with sensory bristles, accessory appendage likewise much larger than in fe- 

 male, and distinctly triarticulate. Inferior antennae in female somewhat longer 

 than the superior, the 2 last joints ot the jicduncle narroAV and elongated, 

 about equal-sized, flagellum but little more than half the length of the peduncle 

 and composed of 7 articulation.^ only; those of male nearly attaining the 

 length of the bodj', flagellum exti-emely slender, and composed of about 12 

 rather elongated articulations. Anterior gnathopoda witli the propodos 

 scarcely exceeding half the length of the carpus, and oblong oval in form, palm 

 about the length of the hind margin, from which it is defined by an obtuse 

 angle, the thumb-like spine nearly exactly as in Syrrho'c crcmdata. Posterior 

 gnathopoda somewhat more slender, and having the propodos narrower. The 

 2 anterior pairs of pereiopoda very slendei", with the carpal joint mucli elon- 

 gated and edged in its outer part with long setae. The 3 posterior pairs 

 with the basal joint but little expanded and narrow olilong in form, posterior 

 edge smooth, meral joint rather large and somewhat expanded in its proximal 

 part, with the inferoposteal corner acutely produced. Last pair of uropoda 

 having the inner ramus a little longer than the outer, and about twice tlie 

 length of t1ie basal part, its inner edge armed witli 2 small denticles, outer 



