274 NEW FOSSIL SHELLS FROM THE TERTIARY OF VIRGINIA. 
M. extuis, Pi. 37. Fre, 1038. 
M. testé acuminato-ellipticd, compressa, tenui, levi, politd; spird altenuatd, obtusd, ovata; suturis obsoletis; anfractibus——, 
planis; anfractu ultimo rotundato; basi levi, acuminaté; apertura angustd, ovatd; columelld plicis quatuor; labro acuto, intus 
costa longitudinalt. 
Shell acuminately elliptical, compressed, thin, smooth, polished; spire attenuate, ovate, obtuse; sutures obsolete; 
whorls ——, flat; last whorl rounded; base smooth, acuminate; mouth narrow, ovate; columella with four folds; 
outer lip acute, with a longitudinal costa within. 
Length .18. Breadth .10 of an inch. 
Remarks.—The spire is covered with a smooth porcelain-like deposite, which oblite- 
rates the sutures, and renders it impossible to determine the number of whorls. ‘The 
most peculiar character about this shell is the internal rib, near the edge of the outer lip, 
FAMILY CONVOLUTID As. 
GENUS OLIVA. 
- 
O. canaricutaTa, Pu. 37. Fie: 104: 
O. testé cylindraced, crassd, lavi, nitidd; spird exsertd, obtusd, scalariformi; anfractibus quinque, angulatis, prope sutwram 
hs 7 ? ) ) Sp 7 ? ‘J Pers ) 
inferiorem incrassatis; suturis valde profundis, latis, canaliculatis; basi acuminatd, strus raris, parvis, transversis; apertura 
lineari, superneé valde incisd, inferne emarginatd; columella multiplicatd; labro acuto. 
9 9 M, g 3 } 
Shell cylindrical, thick, smooth, shining; spire exserted, obtuse, scalariform; whorls five, angular, incrassated near 
i 
the lower suture; sutures very deep, wide, canaliculate; base acuminate, with a few small transverse stria; mouth 
linear, deeply incised above, emarginate below; columella with many folds; outer lip acute. 
Length 1.60. Breadth .70 of an inch. 
Remarks.—The line of incrassation on the lower part of the whorls, is wanting on the 
last one. ‘T'o those of the spire, it gives a peculiar bullate appearance. ‘The sutures are 
larger and deeper than in any other of the genus. The outer lip is attached to the body 
of the shell only by a small transverse plate, near its upper extremity, which causes the 
peculiar suture. This plate does not extend to the edge of the lip. 
There is a specimen of this shell, without a name, in the collection of the Academy of 
Natural Sciences of Philadelphia. I am surprised that it has not been heretofore de- 
scribed, as it is a remarkable shell and by no means rare. It has hitherto, I believe, 
been confounded with one of our recent species, which it distantly resembles. 
O. ANCILLARLEForRMIS, Pi. 37. Fic. 105. 
O. testd ovato-cylindraced, tenui, levi, politd; spird subulatd; suturis canaliculatis; anfractibus 
rolundato; bast levi; apertura sub-triangulart, effusd, minime incisd; columella striis nullis, inferne varice parvo; labro acuto, 
, planis; anfractu ultimo 
Shell oyate-cylindrical, thin, smooth, polished; spire subulate; sutures canaliculate; whorls , flat; last whorl 
rounded; base smooth; mouth sub-triangular, effuse, very slightly incised; columella with no strie,a small varix 
below; outer lip acute. 
os Length .25, Breadth .10 of an inch. 
Remarks.—On one of my specimens there is a deep narrow groove immediately below 
the upper suture. As it exists only on this specimen, and there but at intervals, I sup- 
pose it to be merely a fortuitous character. The mouth is acutely angular above and 
wide below. 
The peculiar conformation of the columella and base of the mouth seem to place this 
shell among the Ancillaric, but its sutures and naked spire separate it from that genus. 
