TO 



JOHN EDWARD GRAY, Esq., F.R.S., 



ETC. 

 KEEPER OP THE ZOOLOGICAL COLLECTIONS IN THE BRITISH MUSEUM : 



WHOSE VALUED FRIENDSHIP AND LEARNED GUIDANCE 



THE AUTHOR 



HAS ENJOYED FOR MANY YEARS, 

 AND 

 WHOSE CONTRIBUTIONS FORM THE MOST VALUABLE PORTION OF IT, 



THIS WORK 



Its gratefully fcrtrieatcfc. 



