Fossil Mollusks From the John Day Basin in Oregon 



SYNOPSIS OF JOHN DAY LAND AND FRESH-WATER 

 MOLLUSKS 



For full accounts of the geological, stratigraphical, and paleon- 

 tologieal features of the region see, Merriam, J. C., A Contribu- 

 tion to the Geology of the John Day Basin; University of Cali- 

 fornia Publications, Bulletin of the Department of Geology, vol. 

 2, No. 9, pp. 269-314, April 1901. Also, same author, and same 

 series of publications, vol. 5, No. 1, pp. 1-64, December, 1906. 

 Also Merriam and Sinclair, Tertiary Faunas of the John Day 

 Region ; same series, vol. 5, No. 11, pp. 171-205, October 1907. The 

 latter has a fairly complete bibliography. 



Ammonitella lunata (Conrad) 



Planorbis (Spirorbis?) lunatus. Conrad, Am. Jour. Conch. Vol. 6, 

 p. 315, pi. 13, fig. 8, 1870-71. (Condon Collection. Bridge Creek, 

 Oregon). White, 3rd. Ann. Eep. U. S. Geol. Surv. p. 448, pi. 32, figs. 

 24-25, 1880-81. Hannibal, Proc. Mai. Soc. London, Vol. 10, p. 159, 

 1912. (The species here is rightly ascribed to Ammonitella and con- 

 sidered distinct from A. yatesi Cooper, a Eecent species. Stearns name 

 was made synonomous. The species is stated to be from "Oligocene, 

 John Day series, Oregon.") 



Gonostoma yatesi (Cooper) Stearns, (in White). U. S. Geol. Surv. 

 Bull. 18, p. 16, pi. 3, figs. 8-12, 1885. Cope and Condon collections. 



Ammonitella yatesi praecursor Stearns. Proc. Wash. Acad. Sci. 

 Vol. 2, p. 656, pi. 35, figs. 8.12, 1900. (Same figures reproduced as 

 in U. S. Geol. Surv., Bull. 18, cited above.) Stearns, Science 

 n. s. Vol. 15, p. 153, 1902. (Mentioned as in the University of Cali- 

 fornia Collection.) Stearns, Univ. of Calif. Publ. Geol. Vol. 5, No. 3, 

 p. 67, 1906. (Mentioned). 



Ammonitella lunata (Conrad) Hanna, Kans. Univ. Sci. Bull., Vol. 

 13, p.... (In the University of Kansas Collection). Mentioned herein 

 as being in the University of Oregon Collection. 



Epiphragmophora antecedens Stearns. 



Helix (Aglaia) fidelis Gray. Stearns, (in White) U. S. Geol. 

 Surv. Bull. 18, p. 14, pi. 3, figs. 1-3, 1885. 



Epiphragmophora fidelis antecedens Stearns. Proe. Wash. Acad. 

 Sci. Vol. 2, p. 653, pi. 35, figs. 1-3, 1900. (Same figures reproduced 

 as in U. S. Geol. Surv. Bull. 18, cited above.) Stearns, Science, n. s. 

 Vol. 15, p. 153, '1902. (Mentioned as in the University of California 

 Collection.) Stearns, Univ. of Calif. Publ. Geol. Vol. 5, p. 67, 1906. 

 (Mentioned.) 



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