IV PREFACE. . 



store-rooms, to which this Guide does not refer. The process-blocks 

 are from photographs of actual specimens in the Museum, and were 

 prepared under my immediate superintendence. The Guide has 

 been written by Mr. R. Lydekker, F.E.S. Some of the woodcuts 

 are borrowed from the 'Cambridge Natural History,' others are 

 from publications already issued by the Trustees. 



E. RAY LANKESTER, 



Director. 



Bbitish. Museum (Natural History), 

 London, S.W. 



March 1th, 1906. 



