128 CALIFORNIA ACADEMY OF SCIEiWCES [Proc. 4th Ser. 



Fauna 



Most of the localities listed below appear to belong to the 

 San Fernando formation of Dumble. A very meagre fauna 

 was obtained from localities x37 and x38 but it appears to be of 

 Pliocene or Pleistocene age. Orbitoides cf. papyracea was ob- 

 tained from localities x59 and x64 and these localities probably 

 represent a lower Oligocene phase corresponding to the Vicks- 

 burg. Unfortunately no mollusca were found with these 

 forms. This list indicates the faunal relations of certain 

 forms satisfactorily. The faunas from localities xl4 and x24 

 are the keys to the relationship of the echinoderms and mol- 

 lusks of known range. Thus locality xl4 yielded Cidaris cf. 

 loveni, sp., Clypcastcr cuhcnsis Cotteau, Macropneustes antil- 

 lariim Cotteau, Astarte, sp., Cardium, sp., Cardium lingua- 

 leonis Guppy, Glycimeris, sp., Meretrix, sp., Ostrea trigonalis 

 Conrad, Panope, sp., Pecten gatunensis Toula, Tcllina, sp., 

 Pctalochonciis, sp., Hcmipj-istis serra Agassiz, Architectonica, 

 sp., Conus inter stinctus Guppy, Cyprcea, sp., Male a r in gens 

 Swainson, Sinum, sp., Turritella, sp., Urosalpinx (?) sp., Xcno- 

 phora, sp. 



Conns interstinctus and Cardium lingna-leonis are forms 

 characteristic of the Bowden beds ; Pectcn gatunensis and 

 Pecteti levicostatus are found in the Gatun horizons and Pec- 

 ten condylomatus is a species previously reported from the 

 Chattahoochee and Chipola horizons of Florida. The faunas 

 from the Chattahoochee, Chipola, Bowden, and Gatun hori- 

 zons represent somewhat different stages — or possibly facies, 

 in part — of a great faunal assemblage which lived during a 

 great period of submergence following the epi-Vicksburg in- 

 terval. The occurrence of Clypeaster cubensis and Macrop- 

 neustes antillanini with these mollusks of known range dem- 

 onstrates that they are members of the Bowden fauna. Hcnii- 

 pristis serra, a shark's tooth which occurs typically in the 

 Miocene of Maryland and the Miocene of California is also 

 reported at this locality. 



Locality x24 yielded Agassicia clevei Cotteau, Clypeaster, 

 sp. 6( ?), Clypeaster cubensis Cotteau, Lovenia dumblei, n. sp., 

 Ostrea, sp., Pecten gatunensis Toula, Ficus mississippiensis 



