EXTINCT MAMMALIA OF NORTH AMERICA. 



367 



The fragment of maxilla in the fossil indicates a depth below the infra-orbital 

 foramen about as great as in the Lion. 



The socket for the the tubercular molar holds about the same relative position as 

 in ordinary Cats, and indicates a tooth about as large as that of the Lion. 



The fossa of the palate, in advance of the alveolus just mentioned, is about as deep 

 as in the Tiger. 



The measurements of the specimen, in comparison with those of the Lion and 

 Tiger, are as follow : 



Depth from infra-orbital foramen to base of crown of sectorial molar, 



Breadtli of crown of sectorial molar, 



Thickness at the position of the inner buttress, 



Thickness of the crown at the posterior lobe, 



Depth of principal cusp. 



Depth of anterior lobe. 



Depth of posterior lobe at fore-part. 



Depth of posterior lobe at back part, 





Lion. 



Tiger 



Lines. 



Lines. 



Lines. 



lar, 15 



14 



14 



151 



16 



16J 



Ik 



8J 



7i 



4J 



5J 



4i 



9 



7f 



71 



7 



6 



6i 



6J 



6i 



6 



5 



4J 



4J 



PSEUDiELURUS. 



Pseudeelums intrepidus. 



See page 52, PL I, Fig. 8. 

 Felis {Pseudcelurus) intrepidus, Leidy : Proc. Ac. Nat. Sc. 1858, 22. 

 Sands of the Niobrara River, Nebraska. Pliocene. 



.^LURODON. 



.Slnrodon feros. 



See page 68, PI. I, Figs. 13, 14. 

 Leidy : Proc. Ac. Nat. Sc. 1858, 22. 

 Sands of the Niobrara River, Nebraska. Pliocene. 



DREPANODON. 



Drepanodon primeevns. 



See page 54, PI. IV. 

 Machairodus primcevus, Leidy and Owen : Proc. Ac. Nat. Sc. 1851, 329 ; 1853, 392 ; 1857, 90 ; 



Owen's Rep. Geol. Surv. Wise. &c. 1852, 564 ; Anc. Fauna Neb. 1853, 95. 

 Drepanodon primcevus, Leidy : Proc. Ac. Nat. Sc. 1857, 176. 



Mauvaises Terres of White River, Dakota. Miocene. 



Drepanodon occidentalis. 



See page 63, PL V, Fig. 5. 



Drepanodon or Machairodus occidentalis, Leidy : Proc. Ac. Nat. Sc. 1866, 345. 

 Mauvaises Terres of White River, Dakota. Miocene. 



