52 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



that of the larger; the latter has a large tooth at its base. Fingers 

 light brown. 



Otherwise much as in G. pugnax. 



Measurements. Male (182G9), length of carapace 4.3, width of 

 same 5.7 mm. 



Range. From Cape Hatteras, North Carolina, to Gulf of Mexico 

 and Yucatan Channel; 13 to 30 fathoms. 



Material examined. See page 51. 



Genus EUCRATOPSIS Smith. 



Eucratopsis SMITH, Araer. Jour. Sci., vol. 48, Nov., 1SG9, p. 391; type, 

 E. crassimanus (Dana) ; Trans. Connecticut Acad. Arts and Sci., vol. 2, 

 18G9, p. 35 (dated "August," but issue destroyed by fire before distri- 

 bution, and not reprinted until November). 



Eucratoplax A. MILNE EDWARDS, Bull. Mus. Comp. Zool., vol. 8, 1880, p. 17; 

 type, E. guttata A. MILNE EDWAiu>s=cms.s-t//mN?/.? (Dana). 



Carapace narrow, panopeoid; regions plainly marked. Fronto- 

 orbital distance from three-fifths to two-thirds of the width of the 

 carapace. Front prominent, separated by a furrow from the slight 

 orbital angle. Eyes stout; the three fissures of the orbit distinct. 

 Antero-lateral margin five-toothed, orbital tooth included; postero- 

 lateral margins moderately convergent. The basal antennal joint 

 reaches a prolongation of the front; the flagellum stands in the 

 orbital hiatus. The buccal cavity widens somewhat anteriorly; the 

 merus of the maxillipeds is not much broader than long. 



Chelipeds very heavy, subequal; palms very high, their upper 

 proximal angle protuberant. Legs narrow, the first and last pairs 

 noticeably shorter than the others. The first segment of the male 

 abdomen reaches across the sternum, the third segment does not; the 

 latter is fused with the two following segments. 



Only the type-species included. 



EUCRATOPSIS CRASSIMANUS (Dana). 



Plate 12, fig. 3 ; plate 159, figs. 1 and 2. 



Eucrate crassimanus DANA, Proc. Acad. Nat. Sci. Philadelphia, vol. 5, 1851 



(1852), p. 248 (type-locality, Rio Janeiro?; Cat. No. 2332, U.S.N.M.) ; 



U. S. Expl. Exped., vol. 13, Crust, pt. 1, 1852, p. 311 ; atlas, 1855, pi. 19, 



figs. 2a-2.il. 

 Eucratopisis crassimanus SMITH, Amer. Jour. Set., vol. 48, 1869, p. 391; 



Trans. Connecticut Acad. Arts and Sci., vol.. 2, 1869, p. 3o. 

 Encratoplax guttata A. MILNE EDWARDS, Bull. Mus. Comp. Zool., vol. 8, 



1880, p. 17 (type-locality, Sombrero; type in Paris Mus.). 



Diagnosis. Carapace narrow, hexagonal; five antero-lateral teeth, 

 including orbital tooth. Chelipeds very heavy. Abdomen of male 

 not reaching the coxae of the last pair of legs. 



