BIBLIOGRAPHY 



Tbe present list only iuclucles tbe titles of works and memoirs which 

 embrace discussions of systematic or distributional relations of tbe 

 re])tiles of the Eegio jSTearctica. 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 Kearctica. 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 North 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 and mammals. 



A. — WorJcs on the classification of Batrachia and Beptilia. 



1817. Cuvier. Eegne Animal. First edition. Paris. 

 1820. Merrem. Systema Amphibiorum. 



1824. Wagler, in Spix Serpentes Brazilium. 



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

 1825. Gray. Genera of Eeptiles in Anuals of Philosophy. London. 

 1826 (June). Fitzinger. Neue Classification der Eeptilien. 



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

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