1914] Dickerson: Fauna of the Martinez Eocene of California 113 



fOstrea appressa Gabb(?) 

 Pecten interradiatus Gabb 

 Psammobia hornii (Gabb) 



fSolen parallelus Gabb 

 Tapes (?)quadrata (Gabb) 



tVenericardia planicosta Lamarck ( ?) 

 Cylichna costata Gabb 

 Cerithiopsis alternata Gabb 



*Cuspidaria dolbraformis (Gabb) (?) 



Dentalium cooperi Gabb 

 Dentalium stramineum Gabb 

 Fusus martinez Gabb 

 Fusus mathewsonii G&bk 

 Galerus excentricus Gabb 

 Lunatia hornii Gabb 

 Niso polito Gabb 

 Perissolax tricarnatus Weaver 

 Aturia mathewsonii Gabb 



* Described by Gabb from his Cretaceous B (= Tejon). 

 t Keported by Stanton from Lower Lake. 



Perissolax tricarnatus and Schizaster lecontei occur abundantly in 

 the type section of the Tejon near Fort Tejon. Modiolus merriami 

 was found in the Tejon on the south side of Pine Canon, Mount 

 Diablo Quadrangle, by the Summer Session class in palaeontology. 

 Flabellum remondianum is questionably reported from the Tejon. 

 The following species were indeterminate : Avicula cf . pellucida Gabb, 

 Megistostoma striata Gabb ( ? ) . 



The type specimen of Turritella conica Weaver appears very 

 similar to a Turritella in the Tejon, but owing to the poor preservation 

 of the type it is impossible to decide the point. Cassidaria tuber- 

 culata (Gabb) is questionably reported from the Martinez at Benicia. 



The absence of the common Martinez species, such as Trochocyathus 

 zitteli (Merriam), Cardita veneriformis Gabb, Cucullaea mathewsonii 

 Gabb, Crassatellites unioides Stanton, Glycimeris veatchii, var. major 

 (Stanton), Lucina turneri Stanton, Leda alaeformis (Gabb), Meretrix 

 stantoni, n. sp., Pholadomya nasuta Gabb, Tellina undulifera Gabb, 

 Ampullina striata Gabb, Amauropsis martinezensis, n. sp., Discohelix 

 calif ornicus Weaver, Heteroterma gabbi Stanton, Heteroterma striata 

 Stanton, Natica lineata, n. sp., Ringinella pinguis Gabb, Siphonalia(f) 

 lineata Stanton, Turritella martinezensis Gabb, Turritella pachecoensis 

 Gabb, Turritella infragranulata Gabb, and Urosyca caudata Gabb 

 from an Eocene fauna is quite sufficient to make its Martinez age 

 questionable. These species are excellent guide fossils because nearly 

 any fossiliferous Martinez locality will yield at least three or four 

 of them. Their range in many cases is through the entire Martinez, 

 but so far as known none occurs in the Tejon or the Chico. A study 

 of the list of Martinez species shows the absence of a great many 

 typically Tejon species. Among the absent ones are : Cardium breweri 

 Gabb, Cardita planicosta var. hornii (Gabb), Corbula parilis Gabb, 



