8 TERTIAKV AND QUATERNARY PECTENS OF CALIFORNIA. 



upon material fioiii a iiuicli wider oeographic- range. Doctor Dall's classification 

 of the family, given in liis "Tertiary Fauna of Florida," not oidy fulfilled this 

 requirement, but had the added desiralnlity of being based partly upon a consider- 

 able amount of west coast Tertiary and living material. Dall's classification, with 

 but slight alteration, has, therefore, been adopted for this paper. 



Collections belonging to the following institutions and individuals were exam, 

 ined by the writer during the preparation of this report: 



United States Geological Survey, Washington. 



United States National Museum, Washington. 



Leland Stanford .Junior T'niversity, California. 



University of California, Berkeley. 



California Academy of Sciences, San Francisco. 



California State Mining Bureau, San Francisco. 



Academy of Natural Sciences, Philadelphia. 



American Museum of Natural History, New York. 



State Museum, Albany, N. Y. 



Mrs. T. S. Oldroyd, Long Beach, Cal. 



Mrs. M. B. Williamson, Los Angeles, Cal. 



Miss L. J. F. Hecox, Santa Cruz, Cal. 



Mrs. Blanche Trask, Avalon, Los .\ngeles County, Cal. 



Mr. F. L. Button, Oakland, Cal. 



Dr. J. J. Rivers, Santa Monica, Cal. 



Mr. J. Howard Wilson, Yonkers, N. Y. 



Dr. Stephen Bowers, Los Angeles, Cal. 



Dr. L. G. Y'ates, Santa Barbara, Cal. 



Mr. Clark Smith, Paso Robles, Cal. 



ilr. Delos Arnold, Pasadena, Cal. 



The writer is indebted to Dr. Wm. H. Dall, of the United States (leological 

 Survey, for kindly assistance and helpful suggestions given during the preparation 

 of this paper. In addition to those already mentioned, the writer wishes to extend 

 his thanks to the following for assistance and courtesies extended: Dr. J. C. Branner, 

 Dr. J. P. Smith, Dr. J. C. Mcrriam, Dr. T. W. Stanton, Mr. Edward Hoitt Nutter, 

 Prof. J. M. Hyde, Mr. G. H. Eldridge, Mr. Homer Hamlin, Dr. T. Wayland 

 Vaughan, Dr. Paul Bartsch, Mr. L. M. Loomis, Mr. F. M. Anderson, Mr. Lewis 

 E. Aubury, Dr. H. W. Faii'banks, Dr. H. A. Pilsbry, Mr. C. W. Johnson, and 

 many others. 



The illustrations are, witii the exceptions noted in the explanations, half-tone 

 reproductions of retouched photographs. To give an even color etfect, the Williams 

 process of coating the specimen was used on most of the specimens before photo- 

 graphing. My acknowledgments and thanks are due to Miss M. K. Sumner, 

 Miss Maude Baggett, Miss ^larian Page, and Mr. H. C. Hiniter, artists; to Mr. 

 E. M. Bane, photographer; and to Messrs. J. L. Ridgway and N. W. Carkhuff, 

 chiefs, respectively, of the sections of illustrations and photography, for the veiT 

 satisfactory execution of the drawings. 



