PREFACE. 



In publishing a second volume of the North American Herpetology, I would 

 offer my thanks to those gentlemen who have lent me their assistance. 



For the Chelonian animals described in this volume, I am indebted 



To Dr. Daniel, of Savannah, for several living specimens of the Trionyx 

 ferox. 



To Professor Troost, of Nashville, Tennessee, for a specimen and beautiful 

 drawing of the Trionyx muticus, and of his Chelonura Temminckii. 



To my friend Dr. Hallowell, of Philadelphia, for remarks on a recent 

 Spai'gis coriacea. 



To Dr. Barrett, of South Carolina, for a fine specimen of one of the most 

 remarkable of all our reptiles — the Chelonura Temminckii, found by him in 

 Alabama. 



