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 PLICACID/A. . 
GENUS ACTEON. 
A. GRANULATUS, PL. 36. Fia. 54. 
A, testd subulatd, crassa, sub-perforatd, noduloso-costatd; spird elevatd, obtusd, mamillatd, ad apicem politd ; suturis im- 
pressis; anfractibus sex, convexis; costis transversalibus, planis, regulariter nodulosis, und levi prope suturam inferiorem; 
anfractu ultimo rotundato; perforatione minima; basi costaté; aperturd ovata, superné angulatd, sub-effusd; plicd columellari 
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, reeularly 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 five on those of the 
spire. ‘The basal coste 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. etososus, Pr. 36. Fic. 55. : 
A. testd ovatd, crassa, cancellatd, wmbilicatd; spird brevi, ad apicem levi et politd; suturis parvis; anfractibus tribus, con 
vewis, rapide crescentibus, supra planulatis; costis octo, transversis, magnis; striis longitudinalibus, parvis, irregularibus; 
anfractu ultimo rotundato; basi cancellatd; umbilico magno; aperturd magnd, sub-ellipticd; columella recta; plicd columellart 
magnd, acuta. 
Shell ovate, thick, cancellate, umbilicate; spire short, smooth and polished at the apex; sutures small; whorls 
three, rapidly increasing, convex, flattened above; coste eight, transverse, large; striae 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 .08 of an inch. 
Remarks.—The longitudinal strive occasionally do not cross the ribs, which, in that 
case, are rounded and polished. The mouth is somewhat semicircular, with the colu- 
mella 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 T’ornatella, 
