114 THE NAUTILUS. 



NEW AND LITTLE KNOWN SPECIES OF AMNICOLIDAE. 



BY BRYANT WALKER. 



SOMATOGYRUS TENNESSEENSIS n. Sp. PI. 5, fig. 8. 



Shell subglobose, perforate, greenish-yellow, smooth with fine lines 

 of growth. Spire short, obtuse; whorls 3|> those of the spires de- 

 pressed, rounded, with an impressed suture; body-whorl large, in- 

 flated, regularly rounded. Aperture large, transversely expanded, 

 sub-triangular, broadly angled above, and somewhat flattened below. 

 Columella narrow with a moderately heavy, rounded, callus, which 

 extends over the parietal wall and, below the minute umbilicus, is 

 separated by a wide axial groove. Lip thick and sharp. 



Alt. 4^, diam. 4.25 mm. 



Shoal Creek, Florence, Tenn. Types (No. 22377 Coll. Walker). 

 Cotypes in the collections of the Academy of Natural Sciences and 

 A. A. Hinkley. 



This species was at first taken to be a form of Conrad's S. 

 pumilus. But on removing the animal it was found to differ so 

 radically in the character of the columella as to forbid its reference 

 to that species. Compared with the specimens of that form from 

 Cahatchee Creek, M.la., while of a similar contour, it differs in being 

 larger, thinner, with a more expanded aperture, and in the narrow, 

 rounded columella. 



SOMATOGYRUS ALDRICHI, n. Sp. PI. 5, fig. 9. 



Shell subglobular, perforate, greenish-yellow, smooth, with very 

 fine, but distinct, lines of growth. Spire very short, depressed, ob- 

 tusely rounded. Whorls 3^, those of the spire slightly convex with 

 an impressed suture ; body-whorl very large, inflated, with a strong 

 carina in front below the periphery, which emerges from below the 

 upper insertion of the lip, and continues about two-thirds around the 

 whorl, where it gradually disappears, not reaching the lip ; the upper 

 portion of the whorl above the carina is regularly, but not strongly 

 convex, but below it is obliquely flattened toward the impressed base 

 of the axis. Aperture large, subcircular, obtusely angled above and 

 regularly rounded below. Columella concave, with a broad, heavy, 

 flat callus, which extends over the parietal wall, and is separated be- 

 low the perforation by a broad axial groove. Lip sharp, thickened 

 within as it approaches the base of the columella 



