PROTOHIPPUS. 



135 



Fig. 108. (Upper) Original figure of anterior part of skull of the type of Protohippus niobrarensis Gidley, Amer. 

 Mus. 10828. _ i. o.f., infraorbital foramen; la.fs., lachrymal fossa. One-half natural size. After Gidley, 1906, fig. 18, 

 p. 151. (Middle) Original figure of lower jaw of the type, external view. One-half natural size. After Gidley, fig. 19, 

 p. 152. (Lower) Original figure of upper and lower dentition of the type. One-half natural size. After Gidlev, 1906, 

 fig. 20, p. 153, 



