PREFACE 



The preparation of the fourth Volume of Ungulate Mammals 

 was Rearing completion when its author was struck down 

 by the illness that proved fatal. With his eharacteristiL- 

 devotion to work, he hardly allowed this to make any 

 difference, under circumstances when most men would have 

 considered themselves luifit for mental effort. It would 

 perhaps have been better if the patient had allowed himself 

 to rest, but the correction of the proofs went on until the 

 task was completed, only two or three days before the end 

 came, on April 16th. 



Mr. Lydekker, although not a member of the permanent 

 staff, had Ijeen officially connected with the Museum 

 since 1884. < )nly those Avho have seen the work from the 

 inside will be aljle to realise the extent and the value of his 

 services to the Museum, where his colleagues liave tlie 

 remembrance of a long and highl}' successful ])eriod of help 

 unremittingly and ungrudgingly given. 



The present Volume includes the families Cervida', 

 Tragulida', Oamelidas, Suidre and Hippopotamida^ thus 

 completing the Artiodactyla. Like its predecessors, it has 

 Ijeen prepared l)y Mv. Lydekker. 



It was hoped that the Catalogue would l)e completed 

 shortly Ijy the publication of a fifth Volume, including the 

 Perissodactyla, the Ilyracoidea, and the Proboscidea, together 

 with addenda to the earlier volumes. It is not possible at 

 present tn state whether this intention can be carried out. 



SIDNEY L. HAEMEK, 



Keeper of Zoology. 



British Muskum (Natukal HiSTOitv;, 

 London, S.W. 



April mh, 1915. 



