PREFACE ix 



Zootomy, to which readers who wish greater detail are 

 referred. For many other facts I am indebted to 

 Dr. Hans Gadow's ATivphihia and Eeptiles, a work which 

 all reptile students should possess. 



Lastly, I have to thank numerous lield-naturalist 

 correspondents in various parts of the country for 

 their assistance and information. 



GERALD LEIGHTON. 



17 Hartington Place, Edinburgh, * 



J\^ovemher 1903. 



