Fui. 122. Front and side views of the jaw of Psittucotltfi-imn multifraiji/ui, showing enlarged 

 gnawing canines, and molars of tuberculo-sectorial derivation. xA. (From Wortrnan, after 

 Scott and Osborn.) 



FIG. 123. Superior and side view of the second upper premolar and the first and second lower 

 molars of Psittaeotlnrium multif<-it<inii<. family Stylinodontidfe, order Tteniodonta, from the 

 Torrejon Formation, Stage II., Basal Eocene, New Mexico. The lower molars may have Ix-en 

 derived from the tuberculo-sectorial type by the loss of the paraconid. x^. (From Wortman, 

 after Scott and Osborn.) 



P-l p. 2 p'-3 p-4 



Flo. 124. Side and superior view of the lower jaw and teeth of Cain motion simples, family 

 Stylinodontidse, order Tseniodonta, from the Wasatch Formation, Lower Eocene. Note the 

 greatly enlarged rootless canine, the cylindrical molars with imperfect enamel, xi. (From 

 Wortman, after Scott and Osborn.) 



