PREFACE ix 



and the illustrations given in the plates exhibit faithfully the particular 

 characteristics of the genera and subgenera. Those skulls which are 

 lacking are fortunately very few. 



The colored illustrations have been selected from those published 

 in the Proceedings of the Zoological Society of London, chiefly by the 

 great artist, my friend the late Joseph Wolf, and, through the kindness 

 of the Council of the Society, it is permitted to reproduce them in this 

 work. Those of the different species from life were taken by Mr. 

 Lewis Medland, F.Z.S., of London, and certain excellent figures taken 

 by Mr. E. L. Sanborn from animals living in the menagerie of the 

 New York Zoological Society, and presented by the Trustees for this 

 work. Measurements of the Primates, such as those confined to the 

 dimensions of the skin removed from the body, are of comparatively 

 little value as there is probably considerable difference in size between 

 the average stuffed specimen and the living animal. But those given 

 of the crania are reliable and important, and not subject to variation 

 after the death of their owners. Body measurements in these volumes, 

 unless followed by (Collector), are taken from the dried skins, and are 

 always given in millimetres. Those of the hands and feet, as the skin 

 of these members usually contains the bones, are reliable for length, 

 but the figures given for dimensions of the body and tail can, in the 

 majority of cases, only be regarded as approximate. Mammals, unlike 

 birds, vary greatly in their dimensions even among examples of the 

 same species, and therefore, equal importance, when taken from the 

 skin, cannot be attached to them. 



When a species in this work is mentioned, the name adopted is 

 printed in capital letters, but in italics for subspecies and synoptical 

 names. Measurements are always given in millimetres. 



All the species and races known to the Author that have been 

 described prior to June 1st, 1912, are included in the three volumes. 

 After the date mentioned, the advanced state of the press work did not 

 permit of any additions, except in an Appendix to the third volume. 



June 1st, 1912. D. G. E. 



