the Marsh Collection, etc. 451 



The fifth and sixth cervicals, transversely, have a more 

 nearly square outline to the neural canal ; the walls of the 

 neural arch are heavier; the vertebral canal is more 

 elongate ; the anterior and posterior faces of the centra 

 are much more concave ; the postzygapophyses stand at 

 a slightly greater vertical angle than in the lion. The 

 transverse processes are directed downward and out- 

 ward ; in F. leo outward and downward. The sixth lacks 

 the upper transverse process of the lion. The seventh 

 closely resembles that of the lion except that the costal 

 facets are large and well defined in the fossil and the 

 ends of the centrum are more concave. 



Measurements of Cervicals. 



5th 6th 7th 



12839 01050 12839 01050 12839 01050 



Q. 



mm. 



mm. 



31 



33 30 



30 30 



74 



52 66 



52.3 66 



Length of centrum 33 



Width across prezvgapophyses 43 

 Width across postzvgapophv- 



ses .51 60 48 61 



Dorsals. — The first is very similar to that of F. leo 

 except that it is slightly smaller and less robust; the 

 fourth has a more oval (flattened from above downward) 

 neural canal, less robust mammillary processes and is 

 in general smaller and lighter than that of the lion. Its 

 posterior articular surfaces extend but slightly beyond 

 the centrum, while in F. leo they extend quite prominently. 

 In the eleventh dorsal, the posterior articular surfaces 

 are more vertical, with the superior section vertical, while 

 in the lion the upper part bends outward, that is, has a 

 more horizontal position. In the lion this vertebra has 

 a vestigial spine, while the fossil possesses a relatively 

 enormous one. The spine is wider, heavier, and longer 

 in the twelfth; the centrum narrower, while the meta- 

 pophyses of the prezygapophyses extend outward, are 

 heavier and more robust, and the anapophyses extend to 

 a line through the posterior margin of the postzygapo- 

 physes in the fossil. In the thirteenth, the metapophyses 

 extend upward and outward; the anapophyses extend 

 slightly beyond the posterior margin of the postzygapo- 

 physes ; and the facets for the rib heads are deeper in 

 this and the twelfth than in Felis leo. 



