1899.] JVortiiiaii, Restoration of Oxycena lupina. 143 



been placed upon the structure of this tooth, and the evidence in 

 favor of such a view is found in the gradual assumption of a 

 similar if not identical structure seen in Hycenodon from the more 

 generalized pattern of the tooth exhibited by Sinopa. The last 

 molar is transverse, and its crown consists of a single external 

 cusp, with a great extension of the antero-external angle, together 

 with a low, smaller internal cusp. 



In the lower jaw the first premolar is small, the succeeding 

 teeth gradually increasing in size to the last molar. Premolars 

 two, three, and four have prominent heels, and the fourth has a 

 small anterior basal cusp in addition. The molars have the 

 typical sectorial pattern, with elevated trigon and a low, relatively 

 small, basin-shaped heel. The internal cusp and heel are reduced 

 m the last molar, foreshadowing its almost complete loss in 

 Patriofelis. 



Vertebrce. — The usual seven cervicals are present which, so far 

 as the imperfect state of their preservation will permit one to 

 judge, resemble closely those oi Patriofelis. The atlas has rather 

 wide, roomy cotyles for articulation with the occipital condyles 

 and the transverse processes are perforated at the base quite as 

 m Patriofelis and the modern Cats. The axis has a peg-like 

 odontoid, a prominent inferior tubercle on the inferior posterior 

 surface of the centrum, and distinct transverse processes, which 

 are perforated at the base for the passage of the vertebral artery. 



The spine is not preserved. The remaining cervicals have 

 rather flattened centra and resemble those of Patriofelis. 



The dorso-lurnbar formula is 20, of which 13 are dorsals and 7 

 are lumbars. They increase in size gradually from before back- 

 wards, the posterior lumbars being the largest. The lumbar 

 articulations are not so complex as those of Patriofelis, the convex 

 postzygapophyses fitting into concave prezygapophyses with no 

 evidence of the double, concavo-convex arrangement of certain 

 of the other Creodonts. There are distinct anapophyses, but no 

 metapophyses appear to have been developed. The sacrum is 

 not preserved. Of the caudals enough are preserved to indicate 

 that there was a long and powerful tail. The vertebrae resemble 

 those of Patriofelis in all their details of structure. 



Fore Limb. — Very little of the scapula is preserved, only the 

 proximal portion of both bones being present. The glenoid cavity 



