1916] Buwalda: Miocene Mammalian Faunas from Tehachapi Pass 81 



the protocone, is markedly crescentic in outline, and is connected with 

 the metaloph. The last three characters are among those which set off 

 the Mcrychippus group from the earlier horses. So far as can be 

 judged from the scanty material, this form should be included within 

 the genus Mcrychippus, but the disconnected protocone indicates that 

 it probably lies within that division of the genus leading toward the 

 Hipparion stock rather than within the division which probably gave 

 rise to Protohippus, PUoMppus, and other forms with connected pro- 

 tocone. 



The Hypohippus material consists of three upper cheek-teeth. The 

 advanced state of wear will probably not permit the safe reference of 

 the form represented by the teeth to any of the described species of 

 Hypohippus. 



The collection from the Cache Peak horizon includes a considerable 

 amount of camel material, consisting of imperfect limb bones, with a 

 few parts of teeth. The remains indicate the presence of at least two 

 forms. Fragmentary teeth and some of the limb bones represent a 

 species near Procamelus. Certain of the other parts, such as a crushed 

 proximal extremity of a metapodial and two imperfect astragali, repre- 

 sent a camel decidedly larger than the first species mentioned. 



Of the two teeth indicating the presence of an oreodont in the 

 fauna one is presumably Mcrycochocrus ; the other may be generically 

 distinct. 



The antelope-like Dromomeryx is represented in the Cache Peak 

 fauna by two lower teeth. While it is not desirable to attempt a 

 specific determination with such scanty material, the characters of the 

 genus are well shown in the accessory median tubercle, the accessory 

 anterior ridge developed from the cingulum, and in the roughened 

 surface of the enamel. The ' 1 Palaeomeryx fold" on the anterior ex- 

 ternal crescent is shown on one of the teeth. Dromomeryx has been 

 reported from middle Miocene to early Pliocene. 



The fragmentary Merycodus material indicates a small species of 

 that genus. This form may be the same as that occurring in the 

 Barstow fauna. 



A felid is known in the fauna by the distal portion of a meta- 

 carpal or metatarsal. 



RELATIONSHIPS OF THE FAUNAS 

 A comparison of the Phillips Ranch and Cache Peak faunas must 

 at present be based largely upon the horses represented in the two 



