150 AMERICAN JOURNAL 



CATALOGUE OF THE OLDER EOCENE SHELLS OF 



OREGON. 



BY T. A. CONRAD. 



The Fossil Shells of the United States Exploring Expedi- 

 tion, collected at Astoria, and published in Dana's Eeport on 

 Geology and Palaeontology, were referred by me to the Mio- 

 cene period. A larger acquaintance with Tertiary Fossils in 

 general, has led me to the conclusion, that their position is in 

 the Older Eocene, and that they correspond in their horizon 

 to the group of Shark Eiver, Monmouth Co., New Jersey; 

 holding, in common, the Aturia ziczac. The shells of Shark 

 River being in the form of casts, not sufficiently characteristic 

 for comparison with those of Oregon, the Aturia is the only 

 species that is certainly common to the two localities, but 

 several of the Oregon species are almost identical with shells 

 of the London Clay of Bracklesham and Bognor. All the 

 species in this catalogue contained in Dana's Report, are with- 

 out other reference than page, plate and figure. 



CEPHALOPODA. 



ATURIA, Bronn. 



A. ZICZAC, {Nautilus,) Sowerby. 



Nautilus angustatus, Con. — P. 728, pi. 20, figs. 5, 6. 

 Pelagus Vanuxemi, Con. — Jour. Acad. Nat. Sci., i., 2d se- 

 ries, p. 130, t. 14, f. 5. 



GASTEROPODA. 



MURICID^. 



PRISCOFUSUS, Conrad. 



P. COEPULENTUS (Fusus,) Con. — P. 728, pi. 20, fig. 4. 

 p. DEVINCTUS {Buccinum?) Con. — P. 728, pi. 20, fig. 2. 

 P. GENICULUS (Fusus,) Con. — p. 728, pi. 20, fig. 3. 

 P. MEDIALIS {Cerithiumf) Con.— P. 728, pi. 20, fig. 1. 

 P. NODIFERUS, Con. — Pi. 20, fig. 12. 

 P. Oregonensis, Con. — PL 20, figs. 10, 11. 



DOLIID^. 



DOLIOPSIS, Conrad. 



D. PETROSUS (DoUum,) Con. — P. 727, pi. 19, figs, 3 and 5. 

 D. BILIRATUM [Dolium petrosum,) Con. — P. 727, pi. 19, fig. 4. 



