To JOHN PRICE WETHERILL, Esquire. 
My Drar Str,—No one has taken a more lively interest ip 
the prosecution of the work, to which this essay forms a supple- 
ment, than yourself; and there is no one who has contributed 
more to its advancement, or to the ant progress of Fossil 
Zoology, in the United States. 
Suffer me then, to dedicate these few pages to you; though 
trifling in themselves, they will be amply sufficient to convince 
_you of the estimation in which I hold your talents and liberality. 
I am with 
the greatest sincerity, 
your friend, 
; JACOB GREEN. 
‘Pamapexrnia, May 1, 1835. 
