INTRODUCTION. IX 



Smithsonian Institution, Washington ; to the Academy of Natural Sciences 

 of Philadelphia ; to the California Academy of Sciences ; to the Boston 

 Society of Natural History ; and to Mrs. Romeo Elton of Boston, for the 

 use of valuable specimens. Finally I wish to express my gratitude to Mr. 

 N. S Shaler, Director of the Geological Survey of Kentucky, and to Mr. 

 Alexander Agassiz, Curator of the Museum of Comparative Zoology, for their 

 liberality in providing for the accompanying plates and map, and to the 

 former for valuable suggestions and information. I also wish to return 

 thanks to Mr. Louis Trouvelot and to Mr. Paul Roetter for the careful 

 manner in which they have executed the map and plates. 



An unexpected delay in the completion of the plates having occurred, 

 several months have elapsed since the main part of the paper was put in 

 type, which has afforded an opportunity to include in the Appendix several 

 valuable communications which were received too late to be inserted in their 

 proper connection. These relate chiefly to the occurrence of the buffalo in 

 Union County, Pennsylvania, and to the date of its extirpation in the Ohio 

 Valley. Matter is also added in respect to the southern limit of the buffalo 

 east of the Mississippi River, especially south of the Tennessee River, which 

 somewhat modify statements made respecting this point in the main body 

 of the paper. Hence the attention of the reader is especially called to these 

 supplemental notes. In the Appendix will also be found an important 

 communication by Mr. Shaler, " On the Age of the Bison in the Ohio 

 Valley." 



J. A. ALLEN. 



Museum of Comparative Zoology, Cambridge, Mass., May 24, 1876. 



