Vol 5] Bovard. — Quaternary Felidae from California. 163 



Machaerodus gracilis Cope 10 from the Port Kennedy Cave de- 

 posits is a smaller individual, has a single-rooted P.., a shorter 

 diastema on the mandible, and a large flange on the lower jaw. 

 M. mercerii Cope 11 is smaller than M. gracilis and has a double- 

 rooted P 3 . 



Dinobastis serus Cope 12 is known only from the upper denti- 

 tion, but is characterized by the shortness of the upper canine 

 and the absence of the inner root of the sectorial. 



Smilodon fatalis Leidy 13 is known only from a small portion 

 of the maxillary and the superior sectorial. It is characterized 

 by the low blade of the sectorial and the well developed tubercle 

 anterior to the protostyle. While 8. calif ornicus shows also an 

 anterior tubercle, the tooth differs so much in size and shape of 

 the protocone that the separation of these two species is not 

 difficult. 



MACHAERODUS (?) ISCHYEUS Merriam. 

 Univ. of Calif. Pub. Geology, Vol. 4, No. 9, p. 171. 



This species is known only from a mandible (No. 8140, Univ. 

 Calif. Col. Vert. Palae.) and is characterized by the great reduc- 

 tion of P 3) the presence of a single posterior cusp on P 4 , the ab- 

 sence of both metaconid and heel from M 1? the shortness of the 

 diastema, the possession of a prominent flange below the sym- 

 physial region, and the abbreviation of the jaw. 



This type differs very strongly from the long slender jaws of 

 the South American cats and from 8. calif ornicus. The presence 

 of P 3 and absence of metaconid and heel from M 1; the shortness 

 of the jaw, and the heavy flange indicate that 8. calif ornicus and 

 M. ischyrus belong to widely separated species if not genera. 



FELIS, sp. indet. 

 PI. 14, fig. 1. 



This specimen (No. 3825, Univ. Calif. Palae. Col.) is repre- 

 sented by a left superior milk sectorial. It was found imbedded 



"'Am. Nat., XIV, pp. 833-858. 



11 Proc. Acad. Nat. Sci. Philadel., 1895, pp. 446-451. 



12 Am. Nat., Vol. XXVIII, pp. 896-897. 



13 Proc. Acad. Nat. Sci. Philad., 1868, pp. 174-176. 



