278 Bulletin American Museum of Natural History. [Vol. XIII, 



premolars, and molars progressively reduced and specialized ; subdigitigrade, 

 metapodials 5-5 spreading, not interlocking. 



Middle Eocene. Upper Eocene. 



Patriofelis Leidy. OxycEuodon Wortman. 



Syn : Limnofelis Marsh. 

 Protopalsis Cope. 



40. f . \. f . i = ? 32. f . \. |. !• = 40. 



Premolars with large talonids. Premolars with talonids. Premolars with small 



talonids. 



Lower Eocene. 

 Oxycena Cope. 



Dentition S. \. #. 



Fig. 8. Patrio/elis ulta. Lower jaw, left side (No. 2691, coll. A. M. N. H.). 



Dentition of Patriofelis. 



The teeth of the animal are so distinctive that they deserve a 

 detailed description ; they exhibit a very decided evolution be- 

 yond those of Oxycena. 



Incisors. — The jaw (No. 1508) exhibits alveoli for two incisors, 

 one of which is placed directly behind the other (Fig. 6). 



Canines. — The alveolus and fang embedded in jaw No. 1508 

 indicate marked lateral compression of both fang and crown. 



Lower premolars. — First., entirely wanting (Figs. 5, 6) ; Second 

 (No. 1508), close to canine, two-fanged, with crown obliquely 

 placed (see Fig. 6, A) ; Third, a somewhat larger tooth longi- 

 tudinally placed, two-fanged, crown not preserved ; Fourth 

 (No. 1508, Fig. 6, A, A', A'), a triconodont type of tooth ; 

 enlarged, antero-posterior diameter of fangs =210 mm. ; a large 

 central protoconid, an anterior cusp (broken away in No. 1508), 



