44 Cincinnati Society of Natural History. 



smooth embryonic whorls form the nucleus. I'hey are followed by 

 four adult whorls. These are covered by elevated, revolving lines, 

 which alternate on the whorl body, and which are crossed by ele- 

 vated lines of growth. The last three whorls l)esides are orna- 

 mented by prominent, obtuse, transverse folds, about ten on each 

 whorl, sigmoidally bent on the body whorl. Aperture angular 

 posteriorly. Outer lip sharp, striated some distance within. 

 Callus spread over the columella. Canal recurved. 



Newton. 



Fiisiis siibscalarinus Heil])r. has whorls which are flattened on 

 their upper part, while those of Fus. Nnvtoncnsis are convex. 



Murex canccUaroidcs, n. sp. 

 Plate II. Figure 15. 



Short-fusiform. Aperture and canal less than half of the 

 length of the shell. Embryonic whorls three. Adult whorls five 

 with crowded oblique, rib-like, varices, becoming obsolete on the 

 body whorl. They are covered by numerous, alternating, promi- 

 nent, elevated, revolving lines. Columella, with an umbilicate 

 fissure. Canal short, straight. Aperture regularly rounded pos- 

 teriorly. Outer lip thickened, crenate within, the crenation at the 

 middle of the whorl being the strongest. 



Newton. 



Only the figured specimen has been found. 



Margimila constrictoides, n. sp. 

 Plate II. Figure 10. 

 Biconical. Spire more than a third the length of the shell. 

 Whorls six, flattened. Columella, with four folds, the uppermost 

 nearly horizontal, the lowest nearly vertical. Aperture straight. 

 Outer lip thickened, crenate. 

 Newton. 



Afargimila coustricta Conv. from Claiborne is similar ; but has 

 the outer lip angular posteriorly, five plaits on the columella, which 

 are besides of different shape and position, has a lower sjiire and 

 is smaller. 



Cylichiia volutata, n. sjj. 

 Plate II. Figure 4. 

 Cylindrical, top regularly conical. Ajierture straight, widen- 

 ing anteriorly. Columella anteriorly with a nearly vertical fold. 

 Newton. 



