1914] Dickerson: Fauna of the Martinez Eocene of California 97 



LIST OF SPECIES (Continued) 



Loc. Loc. Listed by 

 784 790 Stanton 



Dentalium stramineum Gabb x x 



Dentalium, sp X _.... 



Fusus dumblei, n. sp x 



Galerus excentricus Gabb x x 



Heteroterma gabbi Stanton .... x 



Heteroterma, sp x 



Heteroterma striata Stanton x .... x 



Lunatia hornii Gabb x x x 



Lunatia cf. nuciformis Gabb x 



Lunatia, sp., a X 



Natica (Gyrodes) lineata, n. sp x x 



Neptunea, sp .... x 



Natica, sp., e .... x 



Patella, sp .... x 



Perissolax tricarnatus Gabb x 



Einginella pinguis Gabb X x 



Siphonalia(?) lineata Stanton X x x 



Seraphs (?) thompsoni, n. sp x 



Tritonium buwaldi, n. sp X 



Turritella pachecoensis Stanton .... x 



Turritella martinezensis(?) Gabb .... x 



Turritella infragranulata Gabb .... x 



Urosyca caudata Gabb x x x 



Urosyca robusta Weaver x 



Shark tooth x 



A comparison of the fauna listed above with that of our reference 

 zones at Mount Diablo and the type locality brings out at once a 

 striking resemblance between it and that of the basal beds north of 

 Mount Diablo. Both are inshore deposits. This is shown both by the 

 nature of the sediments which constitute them and the character of 

 the included faunas. The ratio of gastropods to pelecypods is about 

 2:41/2 in the above fauna. Not only is this true in the number of 

 different species but a census shows that pelecypods flourished in the 

 waters of the shallow Martinez sea of this time better than the gastro- 

 pods. Out of this total fauna of sixty-four species, the following 

 species have not been found in the Meretrix dalli zone north of Mount 

 Diablo or in higher strata: 



Stylophora(?), sp. Tellina cf. parilis Gabb(?) 



Rhynconella, sp. Venus (?), sp. 



Ostrea buwaldana, n. sp. Yoldia gesteri, n. sp. 



Pecten, sp. Martesia(f), sp. 



Plicatula ostreaf ormis Stanton Aemaea martinezensis, n. sp. 



Phacoides quadrata, sp. Seraphs(?) thompsoni, n. sp. 



Tellina packardi, n. sp. Tritonium buwaldi, n. sp. 

 Tellina perrini, n. sp. 



