SHUMARD—CRETACEOUS FOSSILS. 605 
anterior depression, which appears to be a constant feature in 
the Texan fossil. 
For the favor of describing this interesting shell, I am in- 
debted to G. F. Wright, Esq., who found it in the Washita 
Limestone, on Shoal Creek, near Austin, associated with Zer- 
ebratula Wacoensis, Turrilites Brazoensis, and Ostrea subo- 
vata. It is here confined to a narrow band of a few inches in 
thickness. 
GENUS PANOPSA. 
P. NEWBERRYI, N. Sp. 
of D’Orbigny (Pal. Franc. tom. 8, p. 384, pl. 856, Fig. 1-2), 
but differs in being perfectly closed at the buccal end, while 
Locality.—V ery characteristic of the Caprotina Limestone, 
near the base of our Upper Cretaceous Strata, in Parker 
County, and Comanche Peak, Johnson County. Collected by 
iddell. 
B. F. Shumard and W. P. Ridde 
P. SUBPARALLELA, N. Sp. 
ees approximate, not much elevated, situated considerably 
ie nvanee of the middle; surface marke h a 
gular, narrow, concentric folds, which are most prominen 
On the anterior and upper portion of the shell. 
ength, 3.11 inches; width, 1.58; thickness, 0.94. 
© only example is shell in the collection 1s some- 
— crushed in the His isa a beaks, and not altogether 
Perfect at the anal extremity. It may therefore become ne- 
