1922] Kellogg: Pinnipeds from Miocene and Pleistocene Deposits 25 



On the basis of the evidence afforded by the fossil pinniped 

 described in this paper and by other previously described fossil forms, 

 an attempt has been made to point out some of the problems involved 

 in the evolution of the skeleton and teeth of this group together with 

 a consideration of the phylogenetic relationships of the various genera. 



ACKNOWLEDGMENTS 



The writer wishes to acknowledge his indebtedness to Professor 

 John C. Merriam for his assistance and the kindly interest which 

 he has shown during the progress of the work, and to Dr. Roy E. 

 Dickerson, of the California Academy of Sciences, for the loan of 

 important additional material. The writer is also indebted to Dr. 

 Chester Stock and Mr. E. L. Furlong for advice and criticism. 



Acknowledgment is made here to the following for the loan of 

 recent material for comparison contained in the institutions with 

 which they are respectively connected : Mr. Gerrit S. Miller, United 

 States National Museum; Mr. E. W. Nelson, Bureau of Biological 

 Survey; Dr. Joseph Grinnell, Museum of Vertebrate Zoology, and 

 Mr. Charles D. Bunker, Museum of the University of Kansas. 



The major portion of the new material described in this paper 

 is based on collections made by Mr. R. C. Stoner, Mr. Clarence L. 

 Moody, and especially by Mr. Charles Morrice. The other material 

 consists of an ulna collected near La Jolla by Professor T. D. A. 

 Cockered, portions of a mandibular ramus of a phocid collected near 

 the northwest end of the Tejon Hills by Mr. B. L. Cunningham, and a 

 canine from the Vaqueros formation, collected by O. A. Gavins. 



To Mr. "Walter Granger, of the American Museum of Natural 

 History, and Mr. Francis Harper, of the Bureau of Biological Survey, 

 the writer is under obligation for verifying certain references. All 

 figures in the text were prepared by Mrs. Louise Nash. 



