Vol. XI] BERRY— FOSSIL CHITONS 4Q1 



cene, and has been unfailingly helpful throughout in evincing 

 interest and giving useful advice. 



Acknowledgments are further due to Dr. James Perrin Smith 

 and Mr. and Mrs. T. S. Oldroyd of the Department of Geology 

 at Stanford University, for the loan of the very considerable 

 fossil chiton material in the collections under their care ; and 

 to Dr. Barton Warren Evermann, Director of the California 

 Academy of Sciences, Dr. Roy E. Dickerson, formerly of the 

 same institution, and Dr. Ralph Arnold of Los Angeles, for 

 courtesies of various sorts. 



Thanks are due to Miss Mary J. Rathbun of the United 

 States National Museum for the identification of some crab 

 claws from the Pleistocene of Point Loma, and to Dr. Henry 

 A. Pilsbry of the Academy of Natural Sciences of Philadelphia 

 for determining some barnacle fragments from the same lo- 

 cality. 



Finally, I must not omit mention of my indebtedness to Mr. 

 Herbert J. Powell of Redlands, for his patient work on the 

 drawings used in the accompanying plates. Even though it 

 must be said that we have found that stipple is not, on the 

 whole, the most satisfactory method of illustrating chitons, his 

 results in this direction have added very materially to the com- 

 pleteness and practical working value of this paper. 



Review of Literature 



The literature of Pacific Coast fossil chitons is of scanty 

 extent. It is so scattered that an exhaustive compilation has 

 been rendered correspondingly difficult. Nevertheless, and in 

 spite of insufficient library facilities, the following survey is 

 believed to be reasonably complete. 



The first published mention of the presence of chiton remains 

 in any geological formation within the area under considera- 

 tion, is, so far as the writer has been able to discover, that of 

 Dr. J. G. Cooper in his "Catalogue of Californian Fossils" 

 ( '88, p. 237, 244) . He records : 



Cryptochiton stelleri (Middendorff) — Pleistocene San 



Diego. 

 Ischnochiton magdalensis (Hinds) — Pleistocene Santa 



Barbara. 



