INTRODUCTION. Xili 
Mantell Collectton.—This was purchased in two parts: the first 
from Dr. Gideon A. Mantell in 1836, and the second from his 
executors in 1853. . 
Pomel Collection.—Purchased from M. J. Pomel in 1851. The 
greater part of this collection is made up of specimens from the 
French Miocene. 
Sémmering Collection.—Purchased from Herr Sémmering in 1827. 
Spratt Collection.—Presented by Admiral Spratt, C.B., in 1874 
and 1878. Exclusively from the caverns and fissures of Malta. 
Tesson Collection.—Purchased from M. Tesson in 1857. 
Toulmin-Smith Collection.—Purchased in 1869 from the widow 
of Mr. Toulmin-Smith. 
Wetherell Collection.—Purchased from Mr. N. T. Wetherell, of 
Highgate, in 1871, through Mr. J. Tennant. 
The specimens presented by Mr. C. Falconer are from the collec- 
tion of Dr. Hugh Falconer. 
The abbreviations employed for serial publications are in the main 
those used_in the ‘ Geological Record’ for 1878; but an explanation 
of those used in this part has been appended. 
The metrical system is employed for all measurements. 
In conclusion, I have to express my best thanks to Mr. William 
Davies, of the Geological Department of the Museum, for the 
valuable information he has given me regarding the history of 
individual specimens, and of the different collections, as well as for 
some MS. notes. I also owe him thanks for having looked over 
the proof-sheets of this Catalogue. My thanks are likewise due to 
Mr. Oldfield Thomas, of the Zoological Department of the Museum, 
for much valuable assistance in identifying existing species of 
Mammals, and more especially in the case of the Rodents’. 
RICHARD LYDEKKER. 
The Lodge, Harpenden, 
Hertfordshire. 
Christmas, 1884. 
* It may not be out of place to observe that, in my work on the Fossil 
Mammals of India, published in the ‘ Palzxontologia Indica’ (Memoirs of the 
Geological Survey of India), ser. 10, vols. i., ii., and iii., the names employed 
for several species of Huropean fossil mammals are different from those given 
in the present work. This is owing to the circumstance that I had not then 
the time, or in many cases the means, of entering into the question of the right 
of priority of the names employed, but merely took them on the authority of 
other writers. Some’ errors in the authority for various specific names ae 
occur in that work. 
