MESOZOIC FOSSILS. 637 



PELECYPODA. 



Osteea soleniscus Meek. 



Ostrea soleniscus Meek, 1871: Proc. Am. Philos. Soc, Vol. XI, p. 435. White, 1880: 

 Ann. Kept. U. S. Geol. Surv. Terr, for 1878, p. 9, PI. XI, figs. 2a, b. 1884: Fourth 

 Ann. Kept. IT. S. Geol. Snrv., p. 300, PI. XLII, fig. 1. Stanton, 1894 : Bull. U. S. 

 Geol. Surv.Xo. 106, p. 56, PI. II, fig. 1; PI. Ill, figs. 1 and 2. 



This species is abundant in both the Colorado and Montana formations 

 at Coalville, Utah, and in southwestern Wyoming'. It was obtained near 

 the second crossing- of Snake River, just south of the Park. 



Ostrea sp. 



A small species related to 0. pellucida M. and H. occurs at the same 



locality with the preceding. 



Anomia sp. 



A small species resembling A. propatoris White is represented by 

 several casts from Grlade Creek, Lizard Creek, and near second crossing of 

 Snake River. 



Avicula nebrascana Evans and Shumard. 



Avicula nebrascana Evans and Shuinard, 1857 : Trans. Acad. Sci. St. Louis, Vol. I, p. 38. 

 Pteria (Oxytoma) nebrascana (E. and S.) Meek, 1876: Eept. IT. S. Geol. Surv. Terr., 



Vol. IX, p. 34, PI. XVI, fig. 3a, b; PL XXVIII, fig. 11. Whitfield, 1880 : Geol. 



Black Hills Dakota, p. 385, PI. VII, fig. 4. 



Several specimens from the locality near the mouth of Grlade Creek. 

 It is a widely distributed species in the Fort Pierre shales of the Montana 

 formation. 



Avicula lingileformis Evans and Shumard. 



Avicula linguceformis Evans and Shumard, 1854: Proc. Acad. Xat. Sci. Phila., ]}. 153. 

 Pteria linguiformis (E. aud S.) Meek, 1876: Eept. IT. S. Geol. Surv. Terr., Vol. IX, 



p. 32, PI. XVI, figs. la-d. Whitfield, 1880 : Geol. Black Hills Dakota, p. 384, 



PI. VII, figs. 2 and 3. 



This species occurs with the preceding on Grlade Creek and has about 

 the same geographic and vertical range. 



Inoceramus acuteplicatus n. sp. 



Numerous small specimens referred to this species from locality near 

 the mouth of Glade Creek. (See description on page 634.) 



