326 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Geological Level and Localities of Species of Hyopsodus. 
On account of their great abundance the species of Hyopsodus afford 
valuable data for correlation of the Lower Eocene formations. 
Their occurrence in our collections so far as identifiable is as follows: 
I. Clark Fork basin. 
C. Gray Bull beds (Systemodon zone) 
H. miticulus 24 specimens 
B. Sand Coulée beds 
H. simplex 3 18 fe 
A. Clark Fork beds 
No Hyopsodus 
II. Bighorn basin. 
C. Lost Cabin 
H. walcottianus 2 Me 
H. powellianus browni 1 le 
H. mentalis lysitensis 3 a 
H. wortmani 2 . 
B. Lysite 
H. powellianus 114. $ 
H. powellianus browns 2 . 
H. mentalis lysitensis 96 ae 
H. wortmani minor : Gee: - 
A.» Gray Bull beds. 
) H. maticulus about 450 “ 
III. Wind River basin. i 
B. Lost Cabin 
H. walcottianus 3 
H. mentalis 50 . 
H. iy lysitensis Res Y 2 
A. wortmani | 14 2 
A. Liysite 
H. powellianus 4 4, 
HH. f brownt 92 x 
H. mentalis 1 4 
H. mentalis lysitensis 32 ‘ 
H. wortmani minor 1 : 
Iv. New Mexican Wasatch. 
B. Upper zone (Largo beds) 
, H. mentalis 27 ae 
A. Lower zone (Almagre beds) 
H. mentalis 15 2 
H, ° ?lysitensis 120 . 
H. miticulus sh 9 
oh Mostly from top of lower beds. 
