However, the collection grew apace like that of the other Mam- 

 malia ; no opportunity was lost of making such additions as were 

 required to complete the series, so that the number of specimens 

 appears now, after the lapse of some forty years, to be about trebled. 

 Especially in the course of the last three years, during which the 

 preparation of this volume has been in progress, the collection has 

 received important additions through the efforts of the author, who, 

 besides, has personally visited most of the European Museums with 

 the object of examining types and other important specimens. 



The best thanks of the Department are due to all those fellow- 

 labourers abroad who have given him facilities to attain that 

 object. 



ALBERT GiJNTHEE, 

 Keeper of the Department of Zoology. 



British Museum (N. H.), 

 Sept. 27, 1888. 



