viii PREFACE, 



necessary, and a carefully selected bibliography 

 will be found following each principal group of ani- 

 mals. In the matter of illustration, representations 

 of about five hundred animals and their parts have 

 been given. Many of the cuts are original, and 

 were designed especially to illustrate the habits of 

 the animals, their economic value, etc. Others are 

 from Buckley, Huxley, and various accurate sources 

 already acknowledged. 



The valuable assistance of S. U. Holder is cor- 

 dially acknowledged, and thanks are returned to 

 Mr. Ralph N. Monroe for photographs of the Flor- 

 ida crocodile and for the loan of valuable specimens ; 

 also to Professor E. L. Youmans and Professor A. 

 S. Bickmore for pertinent suggestions and advice. 

 Acknowledgments are also made to Dr. E. P. 

 Wright, of the University of Dublin, for the meas- 

 urements of the gigantic shark Rhinodon ; and to W. 

 Morey, Esq., of Colombo, Ceylon, for the original 

 outline drawing. 



C. F. H. 



NEW YORK, November i, 1884. 



