1452 



CLASS MAMMALIA. 



two upper incisors. Protopsalis is another Eocene American genus ; 

 while Hemipsalodon^ from the White River Miocene of Canada, is the 

 largest form yet known in the suborder, and has the full typical 

 Eutherian dentition. 



Family Proviverrid^e. — The members of this family (fig. 1338) 

 are characterised by the large size of the inner tubercle of the upper 



Fig. 1338. — Skull {a, b, c) and tarsus (d) of Proviverra WhiticB ; from the Wasatch Eocene 

 of Wyoming, U.S.A. Two-thirds natural size. 



true molars, and by the presence of an inner cusp to the blade of 

 those of the lower jaw. The type genus Proviverra (Cynohycenodon 

 or Stypolophus) occurs in the Upper Eocene of both Europe and 

 North America ; one of the European forms being from the Quercy 

 Phosphorites. The skull (fig. 1338) is elongated, and the lower true 



