PLATE XXIV. 
PAGE 
Figs, la, lb. Ulias moratus Cope ■ 50 
la. Outer view of lower jaw. Miocene of Maryland or Virginia. 
Johns Hopkins University. X % 
lb. Upper view of the same specimen. 
Fig. 2. Balaenopteka suksiplana Cope 54 
2. Tympanic bone. Miocene of Maryland or Virginia. Johns Hop- 
kins University. X % 
Figs. 3a, 3b. Natural cast of a Cetacean brain cavity 56 
3a. View from before. X % 
3b. View of the same specimen from the side. x % 
16 
