38 



CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



South of Mount Diablo. 



Acanthoceras tiirtieri White 

 A7ichiira californica Gabb 

 Baculites chicoensis Trask 

 Chio7te varians Gabb 

 Cucullcea trimcata Garb 

 Dentalium cooperi Gabb 

 De?italiuin straniineutn Gabb 

 Eriphyla timbonata Gabb 

 Lilt r aria alveata Gabb 

 Lytoceras baiesi Trask 

 Mactra tenuisshna Gabb 

 Meretrix nitida Gabr 

 Nautilus sp. 



Pachydiscus suciaensis Meek 

 Pec ten operculiforntis Gabb 

 Pijuia breweri Gabb 

 Schlutheria diabloetisis, sp. nov. 

 Scobinella dilleri White 

 Trigonia cequicostata Gabb 

 Trigonia evansana Meek 



Southwest of Martinez. 



Chi one varians Gabb 

 Cifiulia obliqua Gabb 

 Corbula cultriforntis Gabb 

 Cylindrites brevis Gabb 

 Dentalium cooperi Gabb 

 Gyrodes expansa Gabb 

 Gyrodes conradiana Gabb 

 ? Helicoceras verviictdare Gabb 

 Meekia sella Gabb 

 Meckia navis Gabb 

 Meretrix arata Gabb 

 Mytilus pauperculus Gabb 

 Nucula truncata Gabb 

 Pachydtsctis sp. 

 Pecten tnartinezensis Gabb 

 Perissolax brevirostris Gabb 

 Pectunculus veatchi Gabb 

 Pugnellus hamulus Gabb 

 Solarium inortiatum Gabb 

 Tellina crqualis (? ) Gabb 

 Tellina hoffmajini Gabb 



List of Fossil Species from Todos Santos Bay, Lower California. 



Act(Zonina pupoides Gabb 

 Ancyloceras lineatum Gabb 

 Astarte matthewsoni Gabb 

 Bactilites chicoensis (?) Trask 

 Cerithiu)n pilingi White 



Ledo translucida Gabb 

 Lunatia avellana Gabb 

 Mactra ashburneri Gabb 

 Nerita sp. 

 Nucula truncata Gabb 



Cerithiuin totium-saiictorum White Ostrea sp. 



Chione varians Gabb Pectunculus veatchi Gabb 



Cinulia obliqua Gabb Pugnellus sp. 



Coralliochama orcutti White Tellitia cequalis Gabb 



Fulguraria gabbi'SSYWX'E. Tellina doides Gabb 



Fusus sp. Trochus eurystomus White 



Gyrodes expansa Gabb Turritella chicoensis Gabb 



The horizon of Todos Santos Bay in Lower California is 

 evidently that of the Lower Chico, and is supplementary to 

 those of Orange and Los Angeles counties already given. 

 Special weight has been attached by White, Stanton, and 

 others to the occurrence of Coralliocha7na orcutti, and these 

 beds have been generally correlated with those of Wallala, 

 on the coast of Mendocino Count}'-, and with the lowermost 

 Chico of the Sacramento Valley. At Wallala, Coi'alliockama 

 occurs with Solarium ivallala'ense White, Ostrea, Inocer- 

 amtis, Pecten, Cylichna, and Turritella. 



