VUl INTRODUCTION. 



My friend T. M. Logan, M. D., of Charleston, has materially assisted me in 

 this, as in the preceding volumes. 



I have to thank Mr. Charles Rogers, of Charleston, for several drawings of 

 great beauty. 



Mr. Heimans, of Nashville, Tennessee, has sent me at different times drawings 

 of animals of the Western country, done with great spirit and correctness; 

 engravings of which have appeared in the two last volumes. 



In this volume, as in all the preceding, I have abstained from anatomical 

 descriptions, reserving them for the last volume of the work, where the anatomy 

 of each genera will be given, together with the engravings necessary for their 

 illustration: at present I am treating chiefly of the external forms and general 

 habits of the reptiles. 



