PLATE 24. 
Fic. A.—Dorsal view of the skull found in Lenawee county, Mich- 
igan. (No. 1634, Smithsonian collection, National Museum, Washington.) 
The dovetailed recess at the posterior end of the nasals is well shown, 
on the median line, to receive the blunt wedge-shaped portion of the 
frontal bone. Note the difference between this part and the nasals of 
the Kansas specimen. 
Fic. B.—Dorsal view of the Boicourt, Linn county, Kansas, skull, 
showing the heavy scoring of the parietals for ligamentary and muscular 
attachment. Heavy line work denotes restored portions. 
