600 TRANS. OF THE ACAD. OF SCIENCE. 
Upper Cretaceous Limestone, occurring with Exogyra Tea- 
ana and Ammonites pedernalis. 
We have found it in Burnet, Travis, Bosque, Johnson and 
McLennan Counties, and Dr. G. G. Shumard found it holding 
the same geological position several hundred miles further 
westward. Collected by B. F. and G. G. Shumard and W. P. 
Riddell. 
C. BRAzoENszE, n. sp. 
parallel with the cardinal edge to the anterior margin; beaks 
elevated, rounded, strongly incurved, situated a little pos- 
terior to the middle; surface of buccal and umbonial regions, 
marked with fine, pretty regular, concentric striw, which are 
wider than the intervals that separate them, and on the anal 
region or corselet with from eighteen to twenty fine radi- 
ating striz. 
Length, 1.52; width, 1.58; thickness, about 1.38. 
This shell resembles C. multistriatum, but is much more 
gibbous, has a greater number of stria on the corselet, and the 
beak is posterior to the middle, while in the C. multistrialum 
it is anterior. 
Localities—Occurs near the base of the Upper Cretaceous 
Limestone (Caprotina Limestone), in Johnson County, at 
omanche Peak, a few feet above the level of Brazos River, 
and near Patrick’s Creek, Parker County. ; 
GENUS CYTHEREA. 
C. LAMARENSIS, n. sp. 
beaks moderately elevated, closely ineurved, nearly “ ne 
tact, situated in advance of the middle; umbo rounded; | ; 
di : traigh 
margins 
d scarcely 
: : niga . ular 
be noticed upon a superficial examination; anterior mus¢ 
+. * am era 1 edge; poste- 
impression subovate, concave at upper internal edge ; 
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