North Ametloan Fauna Ne. 41, U. 8. Dept. Age., Biological Suwey.        
                                                                        
                                     PLATE I. 
 
 
Longituae We-t trom t~reenwich 
 
 
33' 
 
 
32 
 
 
PLATE 1. 
 
 
North Ainealican Fauna No. 45l U. $. Dept. ASP., Btologloal umresy. 
 
 
34 
 
 
F 
 
 
x3 
 
 
-4 
 
 
I 
 
 
oo 
 
 
Ob- 
 
 
on-