100 



1870, Gray. Supplement to the Catalogue of Shield Keptiles ia the 



British Museum. Londou. 



1872. Euxley. Auatomy of the Vertebrata. Loudon. 



B — Works treating of the geographical distribution of North American 

 Batrachia and Beptilia. 



1857. Agassiz. Contributions to the Natural History of the United 

 iStates, vol. i, i)art i, p. 449. Ou the Geographical Distribution 

 of North American Testudinata. 



18G6. Baird. The Distribution and Migration of North American Birds. 

 American Journal of the Sciences and Arts, p. 78, 184-347 (Jan- 

 uary). 



1SG6. Verrill. Keport of some Investigations upon the Geographical 

 Distribution of North American Birds. Proceedings of the Bos- 

 ton Society of Natural History, vol. x, p. 259 (May). 



18G6. Cope. On the Beptilia and Batrachia of the Sonoran Province 

 of the Nearctic Region. Proceedings of the Philadelphia Acad- 

 emy, p. 300 (October). 



18G9. Cope. Ou the Origin of Genera. Philadelphia. 



1871. Alien, J. A. Bulletin of the Museum of Comparative Zoology, 



vol. ii. No. 3, p. 404. 



1873. Cope. Gray's Atlas of the United States, p. 32. Geographical 



Distribution of North American Vertebrata (with map). 



