PLATES 26, 27. 
Fic. A.—Lateral view of the Lenawee skull. 
Fic. B.—Photograph of the Boicourt skull, showing the large incisor, a, 
withdrawn from its socket to show the full depth of the cavity; ¢ is the 
frontal sinus, d the inner wall removed to show the last molar, e the very 
small brain cavity. 
