596 ARNOLD AND HANNIBAL— MARINE TERTIARY [April 19, 



forms, though the two formations have only one characteristic 

 species, Turris smithi Arn., in common. 



Partial List of Species in the Elk River Formation (Upper Pliocene), at the 

 Seacliff North of the Mouth of Elk River, Port Orford, Oregon. 



(F. F. Wood, H. Hannibal, collectors.) 

 Pelecypoda : 



Cardium corbis Mart.^'' 



Cryptoiiiya oregonensis Dall. 



Kennerlia grandis Midd.^'^ 



Leda acuta Conr.^^ 



Macoma inquinata Desh.s" 



Macoma nasuta Conr.^" 



Modiolus modiolus L.^^ 



Modiolus rectus Conr.^'^ 



Mya truncata L.^" 



Mytilus calif ornianus Conr.^T 



Mytilus edulis L.s" 



Paphia staminea Conr.^" 



Pecten caurinus Gld.^" 



Psephidia lordi Baird.^^ 



Saxidomus giganteus Desh.sT 



Siliqua nuttalli Conr.s^ 



Spisula cf. albaria Conr. 



Spisula f ale at a Gld.^" 



Spisula voyi Gabb (5. alaskana Dall).^'^ 



Thracia trapezoidea Conr. 



Venericardia ventricosa Gld.^" 

 Gasteropoda : 



Amphissa corrugata Rve. and var. versicolor Dall."''' 



Argobuccinum oregonense Redf.^^ 



Bela tabulata Cpr.^^ 



Boreotrophon gracilis Perry.^'^ 



Boreotrophon stuarti Baird.^" 



Buccinum strigillatum Dall.s'^ 



CalUostoma costatum Mart.^''' • 



Caesia fossata Gld.^'' 



Caesia perpinguis Hds.^^ 



Calyptraea fastigiata Gld.57 



Chrysodomus phoeniceus Dall.s'^ 



Chrysodomus tabulatus Baird.^^ 



Columbella gausapata Gld.sT 



Epitonium hindsii Cpr.^^ 



Lacuna vincta Mtg.^'' 



Lepeta concentrica Midd.^" 



Margarites pupilla Gld.57 



•"•^ Species still living. 



