Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean: Vol. 2, Pt. 2

GEOLOGY-FOSSILS.
List and Description of Organic Remains collected during the Exploration of the Central Packsc
Railroad line, by Dr. JAMES SCIIIEL, 1853-'54.
PI., Fig. 1.-Fenestella. Branches slender, bifurcating, with two rows of pores; sometimes but one row; intervals oval or oblong, with rounded angles, and variable in size.
It occurs with Prodtuctus semireticulatus and Productus aequicostatus in the limestone on
Willow creek. It might, perhaps, be referred to Fenest. patula of McCoy.
BRACHIOPODA.
P1., Fig. 2, a, b.-Terebratutla subtilita. Hall, Stansbury's expedition to the Great Salt
lake, 409; P1. 4, Figs. 1, 2. Gibbous, obovoid, valves nearly equal; beak of the dorsal valve
elevated, incurved, perforated at the apex, mesial depression from centre to front; surface
marked with concentric strip and with faint, radiating strieep.
Occurs with Productus splendens, Stiritfer striatus (?) Phtillps8ia, in the carboniferous limestone about six miles west of Westport. In one specimen the radiating stripe are very distinct.
P1., Fig. 3.-Productus s8lendens. Norwood and Pratten. The Producti in the western
States, 11; P1. 1, Fig. 5.
From the same limestone.
P1., Fig. 4, a, b.-Productus aequicostatus. Shumard. Large, elongate, dorsal valve much
elevated; beak small, passing slightly beyond the cardinal border; surface covered by longitudinal ribs, which bifurcate near the beak, and then continue without further division to the front,
the spaces between being occasionally supplied with new ribs. These ribs are slightly sinuous
occasionally, but most of them are straight from their origin to their termination.
Occurs with Fenestella and Productus semireticulatus in the limestone on Willow creek. I
have adopted for this shell the name given to it by Dr. Shumard, who kindly furnished me
with the above preliminary description from his manuscript on the paleontology of the State
of Missouri. A fuller description, and a drawing of a better and more perfect specimen, will be
found in his report.
P1., Fig. 5. —Spirifer, (indet.) Most likely Sp. striatus, yet the specimen is too imperfect
for description.
Occurs with Terebratula subtilita in the limestone near Westport.
CONCHIFERA.
P1., Fig. 6. —Inoceramus, (indet.) The specimen is only a cast of inoceramus from a
yellowish cretaceous limestone near Fort Atkinson.
P1., Fig. 7.-Inoceramus coufertim-annulatus. Roemer, Kreide. Texas, 59. Transverse,
ovate, depressed, with concentric ribs and striee; the spaces between the ribs hardly equal to
their width, and marked with regular, equidistant, elevated lines.
I got this inoceramus in Salt Lake City, as coming from the Upper Green River country. It
belongs to the cretaceous period.
P1., Fig. 8.-Inoceramus ps,eudo-mytiloides. Inequivalved, elongated, with concentric ribs
and strip; anterior part subtruncated; posterior part slightly compressed, with a wing-like
extension of the posterior margin against which the stripe are bending.
It occurs in a gray limestone west of Fort Atkinson. The only difference between this shell
and Inoc. mytiloides is the bending out of the strie.
P1., Fig. 9.-Gryhcea Pitcheri. Shell thick, expanded, distinctly lobed, lower valve
convex, upper valve thick and subconvex; beak distinctly incurved. (Morton.)
It was found on the top of a sand-hill near Grand river, where it occurs in great abundance,
together with impressions of an ammonites. I am indebted for the determination of this shell
to Professor Hall, who has several beautiful specimens in his collection.
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