118 University of California Publications in Geology [Vol.8 



The writer agrees with Dr. Weaver's position in correlating the 

 Martinez with the Midway of the Gulf States. The Tejon bears a 

 much stronger resemblance to the Aquia and Chickasawan than does 

 the Martinez. Harris 31 has given an excellent summary of the Midway 

 stage. 



Genera Common to Martinez and Midway 



There are several species figured by Harris which are very close 

 to forms found in the Martinez- Ostrea crenulimarginata Gabb 

 resembles Ostrea buwaldana very closely, if it is not identical with it. 

 Modiolus saffordi (Gabb) resembles Modiolus ornatus (Gabb). Cucul- 

 laea saffordi Gabb resembles Cucullaea mathcwsonii Gabb. The 

 variety Venericardia planicosta called Venericardia alticostata Conrad 

 resembles a species found in the uppermost Martinez, but none of the 

 species of Venericardia figured by Harris vary from the type of V. 

 planicosta as much as does Cardita veneriformis Gabb. 



Fulgur( ?) dallianum Harris looks like Perissolax blakei. Gyrodes 

 alabamensis Whitf. resembles Gyrodes lineata, n. sp., of the Martinez. 

 Hercoglossa (Enclimatoceras) ulrichi White bears a very close 

 resemblance to Hercoglossa merriami, n. sp. Thus we see that even 

 some specific resemblances can be found between the faunas of the 

 lower Eocene of the east coast and the Martinez of the west. 



The following genera are common to the Martinez and the Midway : 



Ostrea 



Tellina 



Plicatula 



Corbula 



Pecten 



Lueina 



Avieula 



Martesia 



Perna 



Pholadomya 



Modiolus 



Dentalium 



Area 



Aetaeon 



Cucullaea 



Cylichna 



Glycimeris 



Turris 



Nucula 



Pseudoliva 



Leda 



Surcula 



Yoldia 



Olivella 



Venericardia 



Fusus 



Astarte 



Triton (= Tritonium) 



Crassatellites 



Strepsidura 



Protoeardia 



Neptunea 



Meretrix 



Cypraea 



si Harris, G. D., The Midway Stage, Bull. no. 4, American Palaeontology, 

 pp. 1-156, June, 1896. 



