DuNiPACE House, 20th April 1879. 



My deae Pkofessor Newton, 



As you first drew my attention to the subject 

 treated of in the following pages, and wliile 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 AUTHOE. 



To A. Newton, Esq., M.A., F.K.S., 



Professor of Zoology and Comparative Anatomy 



in the University of Cambridge. 



