EUC ALODIUM. 



whorl where they stand closer; last whorl becoming very 

 shortly free in front, distinctly angular at the periphery on 

 the front of the whorl, but soon becoming evenly rounded, 

 the usual peripheral cord being reduced to a mere trace on the 

 latter part of the whorl. Aperture oblique, irregularly ovate, 

 the outer and basal margins regularly arcuate, inner margin 

 straightened; peristome continuous, free, expanded and re- 

 flexed. Columella vertical, obsoletely truncate below. In- 

 ternal axis twisted to form a strong spiral lamella with ob- 

 soletely crenate edge. Length 52, diam. 17 mm. 



Tabasco, southeastern Mexico (Rovirosa). 



E. compactum PILS., Proc. Acad. Nat. Sci. Phila. 1892, p. 

 338, pi. 14, f. 4, (Jan. 24, 1893). v. MART. Biol. Centr.- 

 Amer., Moll., p. 260. 



Related to E. ghiesbregliti, but smaller, with different sculp- 

 ture and unlike in the shape of the aperture. It differs from 

 E. mexicanum by the great solidity of the shell, which is thick, 

 like ghiesbreghti, the distinct and regular striation, and the 

 shortness of the whorls. It is also a broader shell, with con- 

 spicuously flaring outer lip. 



The color of the two shells known is grayish-white, one of 

 them retaining small traces of an extremely thin pale yellow 

 cuticle. There is none of the reddish hue of the allied species. 

 The whorls are unusually narrow. In the type specimen the 

 spiral lamella of the axis is less broadly projecting and less 

 acute than in the youger shell drawn in fig. 2. Its edge is 

 crenulated. The diameter of the shell given in my original 

 description included the lip, and hence does not agree with 

 the dimensions given above ; both descriptions applying to the 

 same individual. 



E. MEXICANUM (' Cuming ' Pfr.). PI. 7, figs. 8, 9, 10; pi. 1, 

 figs. 2, 3. 



Shell sulcate, rimate, turreted, lightly arcuate-striate and 

 under a lens punctulate, but little shining ; violaceous-brown ; 

 suture light, somewhat whitish. Whorls remaining 10, rathex 

 flat, the last obtusely angular below the middle, produced 

 forward, carinate above. Columella provided with a denti- 



