ABSTRACTS OF PAPERS 167 



TENTATIVE CORRELATION TABLE OF THE NEOCENE OF CALIFORNIA 



BY BRUCE L. CLAKK 



FAUNA OF THE LOWER MONTEREY OF CONTRA COSTA COUNTY, CALIFORNIA 



BY BRUCE L. CLARK 



EXTINCT TOAD FROM RANCHO LA RREA 

 BY CHARLES L. CAMP 



{Ah sir act) 



Amphibian boues from Rancbo La Brea stiow tlie existence there of a toad 

 closely allied to present-day forms of the Pacific coast. 



RODENTS OF RANCHO LA BREA 

 BY LEE R. DICE 



(Abstract) 



The rodents found at Rancho La Brea are closely related to the forms living 

 in the same region. 



OCCURRENCE OF MAMMAL REMAINS IN THE ASPHALT BEDS OF MC KITTRICK, 



CALIFORNIA 



BY NEILL C. CORNWALL 



{Abstract) 



In the asphalt deposits of McKittrick certain mammal remains have been 

 found. These seem to indicate that the formation of the asphalt was not 

 later than Lower Pleistocene. 



OUTLINE OF THE HISTORY OP THE CA8T0RIDJE 

 BY W. P. TAYLOR 



(Abstract) 



The beaver family was doubtless derived from Eocene Ischyromyidae. The 

 genera, Par aw j/s (Eocene), Sciuravus (Eocene), and Steneofiber (Oligocene 

 and Miocene), are near, if not actually, members of the phylogenetic series, of 

 which the genus Castor is the latest development. There have been probably 

 at least three beaver intercontinental migrations. The determinations of the 

 age of the Etchegoin formation bears directly on the problem of the first ap- 

 pearance of the genus Castor. 



