CONTENTS OF PART XX. 



RODENTIA (Rodents) — 



Genus Mus p,a„ 



The House Mouse . 64^ 



The St Kilda House Mouse 661 



SCIUROMORPHA . 665 



Castorid^ (Beavers) . . 666 



Genus Castor ..... . 667 



The Beaver .... 668 



Genus Trogontheriuvi . 682 



SCIURID^ (Squirrels and Marmots) . 683 



Genus Sciurus .... 685 



The British or Light-tailed Squirrel . . 688 



The English local names have been revised in part by Mr W. W. Skeat, 

 M.A. {assisted by the late Professor W. IV. Skeat), and in part by 

 Mr C. M. Drennan, M.A. Land., late Scholar Emm. Coll. Camb. ; 

 the Celtic and Gaelic names by Dr E. S. Quiggin, M.A., Ph.D., 

 Fellow and Lecturer in Modern Languages and Celtic of Gonville 

 and Caius College, Cambridge ; while a list of Scottish Gaelic 

 names has been supplied by Mr C. H. Alston. Much information 

 has been taken from Mr G. S. Miller's recently published 

 " Catalogue of the Mammals of Western Europe^' the use of the 

 MS. and proofs of which before publication was kindly permitted 

 by the Trustees of the British Museum of Natural History. 



ILLUSTRATIONS 



Full-page. 



Skins of British Squirrel — Sciurus leucourus. {Coloured?) 

 The Field Mouse. {Black and White.') 



Figures in Text. 

 Diagram of Palate of Mus muralis and Mus musculus. 

 Skull of Beaver (half life size). 

 Cheek-Teeth of Beaver (i^ times life size). 

 Cheek-Teeth of Squirrel — Sciurus vulgaris ( x 5). 



