PLATE XVIII. 
PAGE 
Figs. l-2b. Metopocetus dueinasus Cope' 36 
1. Upper view of skull. Near the mouth ot the Potomac River. 
Museum of the Woman's College of Baltimore. X % 
So., Supraoccipital bone; Sq., Squamosal; Z., Zyzmatic; P., Parie- 
tal; F., Frontal; N., Nasal; Na., External nares; T. R., Tem- 
poral Ridge. 
2a. Anterior view of atlas vertebra. Same locality and collection. 
2b. Upper view of the same specimen. X % 
10 
