INTRODUCTION. 



The chief object in preparing the Appendix has been to give an account of the specimens 

 of Tortoises which have been received since the Supplement was published in 1STU. and to 

 embody the various improvements that have been proposed for the arrangement and 

 determination of the species, and particularly to illustrate the characters that are afforded 

 by the examination of the skull and other parts of the osteology of these animals. 



JOHN EDWARD GRAY. 



British Museum, May loth. 1S72. 



