OXYSTOMATOUS AND ALLIED CRABS OF AMERICA 251 



OSACHILA SEMILEVIS Rathbun 



Plate 77, Figure 1 



Osachila semilevis Rathbun, Proc. U. S. Nat. Mus., vol. 50, p. 652, pi. 36, fig. 1, 

 1916 (type locality, Gulf of Mexico, 25 fathoms; type, U.S.N.M. no. 17851).— 

 Hay and Shore, Bull. U. S. Bur. Fisheries, vol. 35 (1915-16), p. 422, pi. 

 31, fig. 9, 1918. 



Diagnosis. — Differs from 0. tuberosa as follows: Carapace smooth 

 except on elevations; posterolateral margin much shorter than 

 anterolateral; thick, with rounded lobes, the first or lateral lobe 

 projecting sideways equally with the adjacent anterolateral tooth, 

 the last lobe prominent. Elevation between cardiac and meso- 

 branchial elevations absent or insignificant. Outer surface of manus 

 with five rows of tubercles; teeth on upper margin simple. 



Measurements. — Female (17851), length of carapace 11.3, width 

 12.8 mm. 



Range. — North Carolina to northwest Florida; 13 to 27 fathoms. 



Material examined. — See table 82, page 253. 



osachila ANTILLENSIS Rathbun 



Plate 77, Figure 2 



Osachila antillensis Rathbun, Proc. U. S. Nat. Mus., vol. 50, p. 650, pi. 36, fig. 2, 

 1916 (type locality, off Habana, 114 fathoms; type, U.S.N.M. no. 9503). 



Osachila tuberosa A. Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., 

 vol. 47, pi. 4, figs. 4, 5, (part), 1923. 



Diagnosis. — Differs from 0. tuberosa as follows: Carapace eroded 

 all over; posterolateral margin thick, with rounded lobes, the first or 

 lateral lobe not projecting sideways beyond the anterolateral margin. 

 Cardiac region not broadly rounded behind but narrowed and con- 

 tinued backward almost to a point. Proximal tooth on upper margin 

 of manus trifid; outer surface covered with irregular blunt tubercles, 

 reticulating on lower half. 



Measurements. — Female holotype (9503)., length of carapace 19, 

 width 21.6 mm. 



Range. — West Indies; 67 to 164 fathoms. 



Material examined. — See table 83, page 255. 



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