656 TRANS. OF THE ACAD. OF SCIENCE. 
Length, 5.35; height, 1.51; thickness, .82. 
This rare fossil was discovered by Mr. Broadhead in Pike 
county. 
ALLORISMA ENSIFORMIS, Nh. sp. 
Shell large, recurved, subcylindrical, but flattened, tapered 
and rounded towards "the posterior extremity. Valves are 
PecTen HALtit, n. sp. 
Shell small, ovate, coarsely plicate. Left valve convex ; 
raised portion cuneate towards the beak, marked with about 
sixteen high, rounded, radiating cag which are increased 
by implantation near ne nee and sad ane concentric a 
and very distinct et of grow r wing very 
tinct, ——— mar! ed with sre geek to the anterior 
margin; posterior g longer, more acuminate, marke 
with strong striz parallel to the saitanan margin ; sinus ‘ 
the posterior margin deep, broad, and more abruptly curve 
a the cardinal border; beak small, depressed. | ‘. 
ength, .46; height, .44; "length of posterior wing, 22; 
length of anterior wing, .10. 
is fossil resembles the Pecten occidentalis of Dr. oa 
mard, but it is longer in proportion; it has fe chee r ribs, whic 
are not increased by bifurcation as in that spec Wil- 
It was discovered by Maj. Hawn in the Coal rocks at Wi 
low Springs, K. T. 
GASTEROPODA. 
ConvLarta MARIONENSIS, 0. Sp. 
Shell pyramidal, ee Base rhombic; obtuse 7 
teral edges deeply sulcate; sides apoianige = two sets a. 
high, granulated, transverse coste; they commence a wt 
margins and curve towards the base, es ‘partially bac 
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