U S. NATIONAL MUSEUM 



PROCEEDINGS. VOL 83 PLATE 27 



T*W^** 



;-^ 2 



1 .-m^ 



^*A 



%M 



%3* 



PLESIPPUS SHOSHONENSIS 



Mandibles: 1, U.S.N.M. no. 12560 (immature); 2, U.S.N.M. no. 12553; 3. U.S.X.M. no. 12573. Lateral 



views. About one-fifth natural size. Hagerman lake beds, upper Pliocene, Idaho. 



