FROM THE TERTIARY OF VIRGINIA. 257 



A. SCULPTUS, PL. 36. FIG. 59. 



A. testa ovato-acuminatd, crassa, sub-perforatd, cancellatd; spird brevi, cornea, mamillatd, ad apicem lavi; suturis profundis; 

 anfractibus quinque, convexis, ad suturam superiorem sub-canaliculatis ; striis transversis, crebris, magnis; sulcis longitudi- 

 nalibus, parvis, prope suturam inferiorem obsoletis; anfractu ultimo rotundato; basi striatd; perforatione minima; aperturd 

 ovatd, effusd; plica columellari obliqud, obtusd. 



Shell ovate-acuminate, thick, sub-perforate, cancellate; spire short, conical, mamillate, smooth at the apex; sutures 

 deep: whorls five, convex, sub-canaliculate near the upper sutures; striag transverse, numerous, large; sulci longitu- 

 dinal, small, nearly obsolete at the lower suture; last whorl rounded; base striate; perforation very small; mouth ovate, 

 effuse; fold on the columella oblique, obtuse. 



Length .11. Breadth .05 of an inch. 



Remarks. The transverse stria? are extremely numerous. Near the base they be- 

 come alternate. The longitudinal sulcations are small; they are very perceptible near 

 the superior suture, but gradually become obsolete as they approach the lower part of 

 the whorls. The perforation is extremely minute, so much so as to be almost obsolete. 

 The margin of the mouth is continuous round the inner lip. This character is wanting 

 in young and unfinished specimens. The fold on the columella can scarcely be seen on 

 a front view. The upper side of it is perpendicular, the lower very oblique. 



This shell and the last are almost too bullate to be classed with the Acteons. They 

 may, perhaps, more properly belong to the Tornatellse. 



A. NITENS, PL. 36. FIG. 60. 



A. testa ovato-acuminatd, crassd, perforatd, l&vi, politd; spird subulatd, mamillatd; suturis impressis, profundis; 

 anfractibus quinque, convexis; anfractu ultimo rotundato; basi l&vi; perforatione parvd; aperturd ovatd } elongatd } 

 effusd; plied columellari obtusd, crassa. ,->. ; 



Shell ovate-acuminate, thick, perforate, smooth, polished; spire subulate, mamillate; sutures impressed, deep; 

 whorls five, convex; last whorl rounded; base smooth; perforation small; mouth ovate, elongated, effuse; fold on the 

 columella obtuse, thick. 



Length .18. Breadth .10 of an inch. 



Remarks. The mouth is large, acute above and rounded and eifuse below. The last 

 whorl expands rather suddenly beyond the line of the rest, and is more than half the 

 length of the shell. The fold on the columella is broad at base, but slightly elevated, 

 and obtuse. The surface of the shell is remarkably glabrous and shining. 



The external outline has more the aspect of a Phasianella than that of an Acteon. I 

 know none of its congeners to which it is allied. 



o 



A. MILIUM, PL. 36. FIG. 61. 



A. testa bvato-conicdj crassa, perforatd, slriatd, politd; spird sub-attenuatd, conicd, obtusd, ad apicem leevi; suturis 

 linearibus, impressis; anfractibus quinque, planulatis; striis transfer salibus, raris, impressis; anfractu ultimo rotun- 

 dato; basi crebre striatd; perforatione parvd; aperturd ovatd, integrd; plied columellari magnd, aculd, ad basim laid. 



Shell ovately conical, thick, perforate, striate, polished ; spire somewhat attenuate, conical, obtuse, smooth at the 

 apex; sutures linear, impressed; whorls five, flattened; striae transverse, few, impressed; last whorl rounded; base 

 closely striate: perforation small; mouth ovate, entire; fold on the columella large, acute, wide at base. 



Length .10. Breadth .04 of an inch. 



Remarks. On the upper whorls the striae are three in number. On the last whorl 

 they are much more numerous, particularly towards the base, where they become- 

 VOL. ix. 68 



