PLATE XXII. 
PAGE 
Figs. la-2b. Cetotiierium cei-iialum Cope 44 
la. Vertebra. Charles County near the Patuxent River. Acad. Nat. 
Sci., Phila. X % 
lb. Another view of the same vertebra. x % 
2a. Another vertebra. Same locality and collection. x % 
2b. Another view of the same vertebra. X % 
14 
