108 
GEOLOGY—FOSSILS. 
List and Description of Organic Remains collected during the Exploration of the Central Pacific 
Railroad line, by Dr. James Schiel, 1853-’54. 
PI. , Fig. 1.— Fenestella. Branches slender, bifurcating, with two rows of pores; some¬ 
times hut one row; intervals oval or ohlong, with rounded angles, and variable in size. 
It occurs with Productus semireticulatus and Productus aequicostatus in the limestone on 
Willow creek. It might, perhaps, he referred to Fenest. patula of McCoy. 
BKACHIOPODA. 
PI. , Fig. 2, a, b. — Terebratula subtilita. Hall, Stansbury’s expedition to the Great Salt 
lake, 409 ; PI. 4, Figs. 1, 2. Gibbous, ohovoid, valves nearly equal; beak of the dorsal valve 
elevated, incurved, perforated at the apex, mesial depression from centre to front; surface 
marked with concentric striae and with faint, radiating striae. 
Occurs with Productus splendens, Spirifer striatus (?) Phillipsia, in the carboniferous lime¬ 
stone about six miles west of Westport. In one specimen the radiating striae are very distinct. 
PL , Fig. 3.— Productus splendens. Norwood and Pratten. The Producti in the western 
States, 11; PI. 1, Fig. 5. 
From the same limestone. 
PI. , Fig. 4, a, b. — Productus aequicostatus. Shumard. Large, elongate, dorsal valve much 
elevated; beak small, passing slightly beyond the cardinal border; surface covered by longitudi¬ 
nal 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, hut 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 he 
found in his report. 
PL , 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. 
CONCHIEERA. 
Pl. , Fig. 6.— Inoceramus, (indet.) The specimen is only a cast of inoceramus from a 
yellowish cretaceous limestone near Fort Atkinson. 
Pl. , Fig. I.— Inoceramus confertim-annulatus. Boemer, Kreide. Texas, 59. Transverse, 
ovate, depressed, with concentric ribs and strife; 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 Biver country. It 
belongs to the cretaceous period. 
Pl. , Fig. 8.— Inoceramus pseudo-mytiloides. Inequivalved, elongated, with concentric ribs 
and strife; anterior part subtruncated; posterior part slightly compressed, with a wing-like 
extension of the posterior margin against which the strife 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 strife. 
Pl. , Fig. 9.— Gryphcea 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. 
