PREFACE. 



As was stated by Mr. Bouleuger in his Introduction 

 to the first volume, issued in Maj, 1920, the second and 

 conchiding volume was then ready for printing. He 

 has since retired from the service of the Trustees, but 

 he has corrected the proofs and prepared an index to 

 the whole work. 



C. Tate Regan, 

 Keeper of Zoology. 



British Museum (Natural History), 

 London, S.W. 7. 



November, 1921. 



