Oligocene (White River) Felidce. 209 



and the symphysis of the lower jaw with the incisors and 

 canines are broken away. The skull is not figured. The 

 length of the skull from the occipital condyles to the in- 

 cisive alveoli is 6y 2 inches. 



In 1852, Leidy 6 more fully described M. primcevus. 

 The skull is figured in his Table XII, A, figure 5, showing 

 the left lateral view, two-fifths natural size. This is the 

 same specimen noted in the preceding year. Leidy 

 changed his previous figures, however, for the basal skull 

 length, to 6*4 inches. 



Again, in 1853, Leidy 7 rede scribed the original M. 

 primcevus, giving a very complete and detailed descrip- 

 tion. Plate XVIII of his paper shows natural size 

 drawings of the specimen, with a lateral view of the 

 right side of the skull with lower jaw; superior view of 

 the right half of the same ; view of the left side of lower 

 jaw; external view of the right inferior canine; and 

 lastly, an anterior view of the same tooth. The drawings 

 are of the same skull figured in the previous year and 

 referred to in 1851. 



In 1869, in the "Extinct Mammalian Fauna of Dakota 

 and Nebraska,' ■ Leidy 8 changed the name Machcerodus 

 to Drepanodon, and stated that "The Dakota Drepanodon 

 belongs to the second group [Machcerodus, with the acute 

 edges of the canines serrulate and the first lower pre- 

 molar with a trilobate crown and double fang], or that 

 of Machairodus." He examined four nearly complete 

 skulls. Of these, one was described and figured in the 

 1853 paper (the type specimen), two are represented in 

 plate IV, figures 1 and 5, as well as parts of a fourth 

 in figures 2-4 of the same plate in the 1869 reference. 

 The original specimen (or holotype) of M. primcevus, and 

 the skulls represented by figures 1 and 5 of plate IV, 

 Leidy named Drepanodon primcevus, while the parts of a 

 mandible shown in figures 2-4 he referred to a new species, 

 D. occidentalis. 



G. I. Adams, 9 in 1896, made a new species based upon 

 the skull in Leidy ? s figure 1, terming it Hoplophoneus 

 robustus. Professor Marsh had several casts made of 

 the figure 5 skull in the 1869 reference. One of these 



6 J. Leidy, In Owen >s ' ' Eeport of a geological survey of Wisconsin, Iowa, 

 and Minnesota/ ' etc., p. 564. 



7 J. Leidy, Smithson. Contrib. Knowl., 6, art. 7, p. 95. 



8 J. Leidy, Journ. Acad. Nat. Sci. Phila., 2d ser., 7, 54. 



9 G. I. Adams,, Am. Nat., 30, 49. 



