P^RT IV. 



BIBLIOGRAPHY 



The present list only includes the titles of works and memoirs which 

 embrace discussions of systematic or distributional relations of the 

 re])tiles of the Regio Nearctica. Those embracing descriptions of spe- 

 cies only will be added at a future time. 



The subject of general geographical distribution has been especially 

 investigated by Sclater, Huxley, and the writer; while Baird, Agassiz, 

 LeConte, Verrill, Allen, and the writer have devoted themselves espe- 

 cially to the distribution of the animals of the fauna I^earctica. In 1856, 

 Dr. Hallowell remarked the rarity of salamanders and turtles in the 

 Sonoran region,* and Professor Baird has especially demonstrated the 

 complementary relation exhibited in the distribution of lizards and turtles 

 in Korth America. Professor Verrill and J. A. Allen have defined the 

 faunal subdivisions of Eastern North America with great success, 

 basing their conclusions on the distribution of birds and Mammalia. 

 The writer subsequently defined the Sonoran and Lower Californian 

 regions, and elevated the Austroripariau area to the same value, 

 adopting, also, the districts of Verrill and Allen. In the present essay 

 I am greatly indebted to the learned work of J. A. Allen for information 

 on the distribution of birds, as well as to the previous essay of Professor 

 Baird on the birds aud mammals. 



A. — Worlds on the classijicaUon of Batrachia and Beptilia. 



1817. Cuvier. Regne Animal. First edition. Paris. 



1820. Merrem. Systema Amphibiorum. 



1824:. VVagler, in Spix Serpentes Brazilium. 



1825. Latreille. Families Naturelles du Regne Animal. Paris. 



1825. Gray. Genera of Reptiles in Annals of Philosophy, London. 



1826 (June). Fitziuger. Neue Classification der Reptilien. 



*Proc. Acad, Phila., 1856, p. 309, 

 7 H 97 



