AI 



Z61.2 







Uibxanr oi ijjoe üttscum 







OF 







COMPARATIYE ZOÖLOGY, 







AT HARVARD COLLEGE, CAMBRIDGE, MASS. 







JFoitn&efc bs ptfbate stibscrfptfon, fn 1861. 







Deposited by ALEX. AGASSIZ. 







No. ysr3 . 







* 











