PLATE XXIII. 
PAGE 
Figs. 1, 2. Cetotherium cephalum Cope 44 
1. Restoration, one-fiftieth natural size. The shaded portions are 
the actual specimen of one individual. Charles County near 
the Patuxent River, now in the Academy of Natural Sciences of 
Philadelphia. (After Cope, Amer. Nat., Vol. XXIV, PI. XXII.) 
Pig. 2. Skeleton of Plalarusla, minus the fore limbs 44 
