vi INTRODUCTION 



the definition of groups, in order to render the work more 

 acceptable to sportsmen than would be the case if less easily 

 appreciated features were given the first place. 



The opportunity may be taken of correcting the following 

 errors in the first volume : 



P. 81, last line, for E. S. Giinther read E. T. Giinther. 

 P. 102, line 6 from bottom, for 2. 3. 9. 8. read 2. 3. 9. 6. 

 P. 129, bottom line, p. 162, line 16 from top, and Index, pp. 243, 

 244, for Orthagoceros read Orthaegoceros. 

 P. 160, line 10 from top, for 50 read 55. 

 P. 182, line 4 from bottom, for 7f| read 7. 

 P. 184, line 2 from bottom, for 2^ read 2f . 



E. LYDEKKER, 



December IQtJi, 1913. 



