40 BULLETIN 138_, UNITED STATES NATIONAL MUSEUM 



straight back at its outer third; outer angle not dentifortii, scarcely 

 advanced, so that the orbit is very slightly separated from the 

 antero-lateral margin. Coalesced (first plus second) tooth a little 

 longer than orbit, with slightly concave edge, outer corner subrec- 

 tangular; third tooth projecting more than half its length beyond 

 the second, anterior margin a little concave, oblique, posterior mar- 

 gin strongly convex, tip acute; fourth tooth appears to be similar 

 but smaller; the fifth tooth still smaller (/, pi. 10, fig. 1). Postero- 

 lateral margins arcuate, convergent, posterior margin sinuous, con- 

 cave at middle. 



Chelipeds very unequal, the right the larger. Surface granu- 

 late. Merus stout, ujDper margin bearing a distal and a subdistal 

 tooth {d and *, pi. 10, fig. 1) separated by a deep transverse groove. 

 Carpus also with a deep subdistal groove and a conical acute inner 

 spine. Major manus with very convex outer surface; border thick, 

 without marginal line, gradually rounding from the outer to the 

 inner surface, and in profile slightW arcuate; lower border nearly 

 straight, slightl}^ sinuous; proximal end very oblique, terminating 

 at either corner in a backward-pointing lobe, the lower one especially 

 produced (pi. 10, fig. 2) ; distal end partly visible, a large lobe (Z, 

 pi. 10, fig. 2) overlapping the outer surface of the clactylus. The 

 base of tlie dactylus is light-colored ; a stout basal tooth is black and 

 points backward, it is followed by seven other teeth which are indi- 

 cated onty by impressions in the matrix; the first of these is largest 

 but smaller than the basal tooth, the other teeth are irregular in 

 size. Of the minor chela only the upper portion of the manus and 

 the white and granulate basal end of the dactjdus are visible. A 

 slender merus (?«, j^l. 10, fig. 2) of the first right ambulator}^ reaches 

 as far as the arm alongside. 



Paratype a. — This specimen of the same width as the holotype 

 agrees with it in the main so far as it goes. A band of closer granu- 

 lation than that of the general surface borders the front and antero- 

 lateral margins. The outer orbital angle is more pronounced, form- 

 ing a small forward-pointing tooth. The third lateral tooth does 

 not extend so far beyond the second tooth (or lobe) as in the holo- 

 type, tlie fourth extends a shorter distance beyond the third, while 

 the fifth does not project at all beyond the fourth. The narrow 

 portion of the mesogastric region is faintly outlined; it tapers 

 gradually to an acuminate point. The left appears to be the major 

 cheliped, the merus (pi. 10, fig. 4) measures 11.4 mm. long above, 

 and the impression of the chela 27 mm. long below. 



Paratyye h. — The frontal and right antero-lateral portion of the 

 carapace of a larger specimen remain, but much defaced. The outer 

 orbital angle is stronger than in paratype a and the relation of the 

 third to the second lateral tooth is the same as in that specimen. 



