through the middle of moderate width; volutions 
Sl ee eae ees, 
orly less distinct, posterior side produced, 
: aeeus extremity angulated ; ligament 
Fossil Shells of Tampa Bay. 399 
Art. XXXVII.—Deseriptions of new species of Organic Re- 
mains from the Upper Eocene Limestone of Tampa Bay ; by 
T. A. Conran. 
Buuincs. 
— Bulimus floridanus.—Ovate-acute, narrow; whorls 6? 
finely striated obliquely ; spine elevated, longer than the 0) 
aperture, whorls convex; body whorls with an impressed 
line which margins the suture ; aperture narrow, subovate, labrum 
and labium reflected ; base with a seep channel behind the re- 
flected labium. 
This is the only fossil land shell yet discovered in an American 
tertiary formation. Very few species of this genus exist in North 
America, and they are all limited to the southern portion of the 
Union. The B. floridanus is very dissimilar to any of these, 
being much less ventricose and having more affinity with the 
group constituting the genus Partula. 
Butua. 
Bulla petrosa. —Oval, destitute of striz? summit 
onli que. 
~ Ballast Point, Tampa Bay. Rare. 
; NouMMuLitTEs. 
Numinubites floridanus.—Discoidal, diameter 
about 3 in number; surface with wistane revolving 
lines. 
Occurs with the preceding. Abundant. It be- 
ie to the subgenus Assilina, D’Orbigny. 
Cristellaria rotella—Discoidal, with impressed radii ; a9 
middle of the. anterior side with a sudden depression. 
Abundant. Occurs with the preceding. 
This small fossil can be distinctly seen without a meter 
and some specimens are large enough to shew the impressed lines. 
It closely resembles a species of the Paris Eocene. By br 
the rock into small fragments, specimens. will fall out entire. 
Venvs. : 
Venus penita.—Cuneiform, concentrically A {(( 
Striated, the lines strong anteriorly, posteri- 
