596 TRANS. OF THE ACAD. OF SCIENCE. 
GENUS BACULITES. 
B. GRACILIS, n. sp. 
Shell very slender, gradually tapering to apex; transverse 
section varying from broad ovate to subcircular; surface in 
some specimens nearly smooth, but usually marked with 
moderately prominent, rounded costw#, which on the dorsum 
are distinct and arched towards the aperture, and on the 
sides curve obliquely backwards and downwards to the ventral 
argin, before reaching which they become nearly obsolete. 
Some of the specimens exhibit very fine flexuous strie 0 
owth. 
from a fragment having a diameter of two lines, this being 
the only specimen in the State collection showing the form 
of the lobes distinctly. i 
The diameter of the largest fragment found is 0.50 of an 
inch, but the diameter of most of the specimens does not ex- 
ceed 0.25 of an inch. This shell may be compared with B. 
Neocomiensis of D’Orbigny, from which it differs in the et 
of the septe, the lobes being porportionally wider and the 
saddles narrower in our species. “th the 
ocality.—In nodules of argillaceous iron stone, wit Col- 
preceding species, Shawnee Creek, Grayson County. \° 
lected by G. G. Shumard. 
GASTEROPODA. 
GENUS CERITHIUM. 
C. BosquENsE, N. sp. 
Shell large, elongate-conic, turreted ; spiral ang 
volution fines ekabWe) flattened ; last volution Sonal mi 
shorter than the width, rounded beneath; aperture ovil 
oblique, contracted above and below, and wides 
middle; surface of volutions marked with 11-12 broa tind 
ed longitudinal ribs or folds, which are moderately ; edge 
above, and become obsolete before reaching the inferior 
of the volution. 
