DuNiPACE House, 20th April 1879. 



My deae Professor Newton, 



As you first drew my attention to the subject 

 treated of in the following pages, and while my inquiries were 

 proceeding, kindly assisted me by continued advice, I desire 

 to inscribe to you this little volume, and to remain yours very 

 truly and obliged, 



THE AUTHOR 



To A. Newton, Esq., MA., F.R.S., 



Professor of Zoology and Comparative Anatomy 

 in the University of Cambridge. 



