FROM THE TERTIARY OF VIRGINIA. 267 
naked eye. The base is smooth, with the exception of two or three small stria, imme- 
diately below the periphery of the whorl. As my only specimen is imperfect, I am 
unable to determine the dimensions or number of whorls. 
The smooth base and peculiar rounded columella distinguish this shell from our other 
tuberculated fossil T'rochi, some of which it much resembles, 
This pretty little shell was sent to my father from the neighbourhood of Petersburg 
by E. Ruffin, Esq., whose name I have great pleasure in affixing to it as a slight token 
of respect for his zeal in elucidating the Geology of Virginia. 
GENUS TURBO. 
T.. auaber, Px. 37. Fie. 87. 
T, testd ovato-turbinatd, elevatd, tenui, wmbilicatd, levi, nitente; spird elevatd, rotundati; suturis parvis, linearibus; 
anfractibus , valde convexis; anfractu ultimo rotundato; basi levi; umbilico parvo; aperturé ovatd, superne angu- 
latd, inferne rotundatd; labro acuto. 
Shell ovately turbinate, elevated, thin, umbilicate, smooth, polished; spire elevated, rounded ; sutures small, linear; 
whorls , very convex; last whorl rounded; base smooth, umbilicus small; mouth ovate, angular above, rounded 
below; outer lip acute. 
Length ——. Breadth .80 of an inch. 
Remarks.—The umbilicus is small, and partially covered by an extension of the co- 
lumella. ‘The surface of the shell is glabrous, but not perfectly smooth, owing to ine- 
qualities in the growth, with occasional faint longitudinal lines. ‘The mouth has a small 
internal channel-like impression where it meets the preceding whorl. 
Having but one specimen of this shell, and that imperfect at the apex, I am unable to 
give its length or number of whorls. Of the latter, a little more than two remain, and 
about two or three must have been removed. 
This shell bears so strong a resemblance to the recent Paludina vivipara, Auct., that 
were it not found among oceanic shells, I should have little hesitation in considering it as 
a variety of that species. 
This shell is by far the largest of the genus as yet discovered in our Tertiary. It is 
unusually elevated in the spire for a ‘Turbo. 
T. rnusticus, P1::37. F1e.-88. 
T. testa globoso-conicd, crassa, perforata, cancellatd; spird conicd, depressd, acutd; suturis parvis, Uinearibus; an~ 
fractibus quinque, planulatis ; striis transversis crebris, magnis; striis longitudinalibus crebris, parvis; anfractu 
ultimo rotundato; basi striatd transverse et alternatim; perforatione parva, angustd; apertura quadrato-rotundaid. 
Shell globosely conical, thick, perforate, cancellate; spire conical, depressed, acute; sutures small, linear; whorls 
five, flattened; transverse striw numerous, large; longitudinal striae numerous, small; last whorl rounded ; base striate 
transversely and alternately; umbilicus small, narrow; mouth quadrately rounded, 
Length .12. Breadth .11 of an inch. 
Remarks.—The transverse strie on the upper part of the last whorl show a slight 
disposition. to be alternate, and on the base they become entirely so. The whorls are 
sub-canaliculate at the upper sutures. ‘The columella has a very slight incrassation at 
the base, but not sufficient to constitute the shell a Monadonta. The mouth is angular 
at the upper part of the columella, and round at the outer lip. 
