PLATE XVII. 
PAGE 
Figs. 1, 2. Delphixodon mento Cope 28 
1. Anterior tooth. Charles County near the Patuxent River. Acad. 
Nat. Sci., Phila. x % 
2. Anterior tooth. Same locality and collection. ■ % 
Figs. 3-5. Delphinodon leidyi Hay 29 
3. Anterior tooth. Charles County near the Patuxent River. Acad. 
Nat. Sci., Phila. x % 
4. Anterior tooth. Same locality and collection. x % 
5. Anterior tooth. Virginia. Acad. Nat. Sci., Phila. x % 
Figs. Ga, 6b. Hypocetus atl.4.nticus (Cope) {A^?r)r^CiM'ys). 30 
6a. Upper view of skull. Drum Point. Johns Hopkins University. 
X Ve 
6b. Lower view of the same skull. x % 
Fig. 7. Orycterocetls ct.ocodeh.\us ( ?) Cope 32 
7. Anterior tooth. Charles County near the Patuxent River. Acad. 
Nat. Sci., Phila. 
