PLATE XXVII. 
PAGK 
Pigs. 1, 2. Thecaciiampsa ( ?) sericodon Cope 65 
1. Tooth. Charles County near the Patuxent River. Acad. Nat. Sci.. 
Phila. 
2. Tooth. Same locality and collection. 
Figs. 3-5. TiiECACHAMPSA (?) sicARiA Cope 66 
3. Crown of a tooth. (After Cope.) x % 
4. Portion of lower jaw. (After Cope.) x % 
5. Another view of the same. (After Cope.) x % 
Pigs. Ca, 6b. Thecachampsa ( ?) coxtusor Cope 66 
6a. Lateral view of tooth. Charles County near the Patuxent River. 
6b. Basal view of the same specimen. 
Pigs. 7-9. Thecachampsa (?) astiqua (Leidy) 67 
7. Tooth. " High cliffs of the Potomac River, 40 miles above the 
mouth of the river in Westmoreland County, Virginia." Acad. 
Nat. Sci., Phila. X % 
8. Another tooth from the same locality and collection. X % 
9. Another tooth from the same locality and collection. X % 
