588 



ARNOLD AND HANNIBAL— MARINE TERTIARY [April 19,. 



Partial List of Species in the Monterey Formation (Oligocene-Miocene) of 

 the Clallam Bay District, Washington, and at Astoria, Oregon. 



Pelecypoda: 



Acila conradi Meek 



Area devincta Conr. {A. montereyana Osmont)^*. . 



Area trilineala Conr 



Diplodonta parilis Conr 



Dosinia whitneyi Gabb" 



Leda pejiita Conr.^'' 



Macoma piereei Arn.^'' 



Mareia oregonensis Conr. (M. siihdiaphana Cpr.)" 



Modiolus rectus Conr. (M. directus Dall)*^ 



Panope generosa Gld.''^ 



Pecten fucanus Dall^^ 



Pecten propatulns Conr.-''' 



Phaeoides aeiililinealus Conr 



Solen curtus Conr 



Spisula albaria Conr 



Spisida catilliformis Conr.-i^ 



Tellina arctala Conr.*^ 



Tellina nueidana Dall''-' 



Tellina ohruia Conr. (2". albaria Conr.) 



Tellina oregonensis Conr 



Thracia trapezoidea Conr 



Thyasira bisecla Conr.^= 



Venericardia siiblenta Conr. (F. qiiadrata Dall)^^. . 



Venus clallamensis Rgn. (l^. ensifera Dall)^'' 



Venus olympidea Rgn.^'' 



Yoldia impressa Conr 



Yoldia oregona Shum 



Gasteropoda: 



Ampullina oregonensis Dall 



Ca;sia arnoldi F. M. And 



Chrysodomus nodiferus Conr. {Fusus stanfordensis Arn.) 



Crepidula prwrupta Conr 



Cylichnella petrosa Conr.-"^ X 



Ficus stanfordensis Arn 



Fusinus corpulentus Conr. {F. medialis Conr.)^'' X 



Fusinus devinctus Conr.''^ X 



Natica oregonensis Conr \ X 



Potinices saxea Conr.^^ 



Priscofusus genictilus Conr.*^ X 



Sinum scopidosutn Conr X 



Tiirris wynoocheensis Wvr.'*'' 



Turrilella oregonensis Conr.^'' ' X 



SCAPHOPODA : 



Dentalium conradi Dall (D. pelricola Dall) X 



Cephalopoda: 



Aturia angustata Conr 



160 161 162 163^ 



X 



X 

 X 



X I X 



Locality 43; basal sandstone, beach at foot of 19th Street, Astoria, Oregon. 

 (H. Hannibal.) 



** Species characteristic of this horizon. 

 *5 Species still living. 



