FROM THE TERTIARY OF VIRGINIA. 41 



naked eye. The base is smooth, with the exception of two or three small striae, 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 Trochi, 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. GLABER, PL. 37. FIG. 87. 



T. testa nvato-turbinald, elevatd, tenui, umbilicatd, Itsvi, nitenle; spird elevatd, rotundatd; suturis parvis, linearibus~, 



anfractibus , valiU convexis; anfractu ultimo rotundato; basi lavi; umbilico parvo; aperturd ovatd, superne angu- 



latd, inferni 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 occasipnal 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. RUSTICUS, PL. 37. FIG. 88. 



T. testa globoso-conicd, crassd, perforatd, cancellatd; spird conicd, depressd, acutd; suturis parvis, linearilus; an- 

 fractibus quinque, planulatis; slriis transversis crebris, magnis; striis longitudinalibus crebris, parvis; anfractu 

 ultimo rotundato; basi striata transverse et alternation; perfnratione parvd, angusta; aperturd quadrato-rotundatd. 



Shell globosely conical, thick, perforate, cancellate; spire conical, depressed, acute; sutures small, linear; whorls 

 five, flattened; transverse striie numerous, large; longitudinal stria; 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 stria3 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. 



