﻿292 CONRAD'S DESCRIPTIONS OF 



lines'; spire rather longer than aperture, first two whirls smooth ; beak perfectly 

 straight, minutely striated to the extremity. , 

 locality. — Alabama. Dr. Showalter. 



VOLUTILITHES, Swainson. 



Volutilithes limopsjs. PI. 47, fig. 24. Subfusiform ; volutions seven ; body whirl 

 longitudinally ribbed ; ribs angular, acutely tubercular on the upper part; revolving 

 lines prominent, acute, more salient where they cross the ribs, about twenty-seven in 

 number ; whirls of spire slightly convex, five series of tubercles on last volution ; 

 aperture narrow-elliptical ; inner lip with a thin, wide deposit ; columella with three 

 plaits, the superior one obsolete or very small. 



Length II inches. Diameter f inch. 



A beautiful species resembling V. crenulata, Lam., or more nearly V. ambigua, but 

 it has a more fusiform shape than either, a narrower aperture and dissimilar folds on 

 the columella. 



Volutilithes kugata. PI. 47, fig. 32. Fusiform; spire somewhat elevated; volu- 

 tions eight, convex, with minute, reticulated lines, the revolving lines microscopic ; 

 larger revolving lines prominent ; ribs on the body whirl irregular, wanting near the 

 base ; an impressed line revolves below the suture, giving that part of the shell 

 between this line and the suture an obscurely or obtusely carinated character; re- 

 volving lines on the body whirl distinct; a deposit on the inner tip ; columella with 

 three approximate, obtuse folds, the middle one obsolete ; aperture narrow. 



Length 2 inches. 



Subgenus ATHLETA, Conrad, 

 V. (Athleta) leioderma. PI. 46, fig. 32. Subfusiform. smooth and polished; spire 



scalariform, angle callous ; shoulder over the aperture with a projecting callus ; 



aperfure long and effuse ; labrum slightly notched or sinuous at the superior extremity ; 



columella 4-plaited ; plaits very oblique ; superior one obsolete. 

 Locality. — Tippah Co., Mississippi. Dr. Spillman. (Cretaceous.) 

 A beautiful and very perfect shell, the suture covered by a deposit as in the genus 



Ajstcilla. 



SIMPULUM, Klein.— TEITON, Lam. 



The type of this genus is Triton succincticm, Lamarck. 



Simpulum Showalteri. PL 47, fig. 11. Fusiform; whirls eight, angular, periphery 

 of angle acute, situated below the middle of the whirl ; whirls of spire costate longi- 

 tudinally, but not very distinctly ; revolving lines closely arranged, fine, with a few 

 distant, prominent lines ; three first whirls of the spire smooth, the next two tubercu- 

 lated ; angle tuberculated ; a prominent, acute line on the body whirl runs from the 



