FROM THE TERTIARY OF VIRGINIA. 255 



Length .16. Breadth .25 of an inch. 



Remarks. The flattened whorls and incrassated outer lip at once distinguish this 

 shell from all its congeners. 



FAMILY 



GENUS ACTEON. 



A. GRANULATUS, Pi. 36. FlG. 54. 



A. testa subulatd, crassd, sub-perforatd, noduloso-costatd; spird clevatd, obtusd, mamillatd, ad apicem politd ; suturis im- 

 pressis; anfractibus sex, convexis; costis transversalibus, planis, regulariter nodulosis, und Icevi prope suturam inferiorem; 

 anfractu ultimo rotundato; perforatione minima; basi costatd; aperturd ovatd, superne angulatd, sub-effusd; plied columellan 

 magnd, acutd. 



Shell subulate, thick, sub-perforate, nodulously costate ; spire elevated, obtuse, mamillate, polished at the apex'; 

 sutures impressed; whorls six, convex; ribs transverse, flat, regularly nodulous, a smooth one near the lower suture; 

 last whorl rounded; base costate; perforation very small; mouth ovate, angular above, somewhat effuse; fold on the 

 columella large, acute. 



Length .18. Breadth .08 of an inch. 



Remarks. The nodules on the ribs are small and in regular order, giving the shell a 

 granulate and cancellated appearance. The fold on the columella is placed about the 

 middle, and is quite large. The mouth is rounded below and acutely angular above. On 

 the body whorl the ribs are about eight in number, while there are live on those of the 

 spire. The basal costse are smooth and smaller. 



Judging from description, this shell is not unlike A. pomilius and A. idoneus, Conrad; 

 but may be distinguished by the perforation, mamillate apex, and the smooth rib near 

 the lower suture. 



A. GLOBOSUS, PL. 36. FIG. 55. 



A. testa ovatd } crassd, cancellatd, umbilicatd; spird brevi, ad apicem leevi et politd; suturis parvis; anfractilus tribus, con- 

 vexisj rapide crescentibusj supra planulatis; costis octo, transversis, magnis; striis longitudinalibus, parvis. irregularibus; 

 anfractu ultimo rotundato; basi cancellatd; umbilico magno; aperturd magnd) sub-ellipticd; columella recta; plied columcllari 

 magnd, acutd. 



Shell ovate, thick, cancellate, umbilicate; spire short, smooth and polished at the apex;, sutures small; whorls 

 three, rapidly increasing, convex, flattened above; costae eight, transverse, large; strias longitudinal, small, irregular; 

 last whorl rounded ; base cancellate; umbilicus large; aperture large, sub-elliptical; columella straight; fold on the 

 columella large, acute. 



Length .10. Breadth .OS of an inch. 



Remarks. The longitudinal strise occasionally do not cross the ribs, which, in that 

 case, are rounded and polished. The mouth is somewhat semicircular, with ihe colu- 

 rnella for a base. On the upper whorls there are but four ribs, the rest being concealed 

 by the succeeding growth. About a whorl and a half near the apex, are perfectly 

 smooth. 



This is a very pretty little shell, and bears no decided resemblance to any of our fossil 

 species. It is unusually globose for an Acteon, but can hardly be placed in the kindred 

 genus Tornatella. 



