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 : 



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



Brea Jtb of crown of sectorial molar, 



Thickness at tbe position of tbe 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. 



PSEUD^LURUS. 



Psendeelurus intrepidus. 



See page 52, PL I, Fig. 8. 

 Felis (Pseudcslurus) intrepidus, Leidy : Proc. Ac. Nat. Sc. 1858, 22. 

 Sands of the Niobrara River, Nebraska. Pliocene. 



^LURODON. 



iElurodon ferox. 



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

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

 Sands of the Niobrara River, Nebraska. Pliocene. 



DREPANODON. 



Drepanodon primeevus. 



See page 54, PL IV. 



Machairodiis primeevus, 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 primcBvus, 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. 



