PEEFACE TO THE SIXTH EDITION. 



IN the present edition the names of all the specimens added 

 to the Collection during the years 1872, 1873, 1874, and 

 1875 have been inserted in their proper places. 



The result shows that since the commencement of the 

 year 1861 we have exhibited specimens of 570 different 

 species of Mammals, 1224 of Birds, 227 of Reptiles, 39 of 

 Batrachians, and 83 of Fishes, in all 2143 species of Ver- 

 tebrated animals. 



The subjoined Table of the number of Species of the 

 principal classes of Vertebrates included in the successive 

 editions of the Catalogues will serve to give some idea of 

 the progressive development of the Collection : 



P. L. S. 



11 Hanover Square, W. 

 Feb. 8th, 1877. 



