1886.] The Phylogeny of the Camelide. 621 
Leidy. The P. occidentalis (Fig. 12) appears to occur wherever 
the Loup Fork beds exist, from New Mexico north and east to 
Dakota. The P. angustidens Cope, intermediate in size between 
this form and the P., robustus, is not rare in Kansas and Colorado. 
Six or seven species of this genus have been named, one of them 
from teeth found near Richmond, Virginia. Species of the genus 
probably occur in beds of corresponding age in Florida. 
Pliauchenia has been found as yet only in New Mexico, in two 
species not well preserved. It is not certain that any species of 
6 
Rte 12.— Procamelus occidentalis Leidy, one-third nat. size, from Loup Fork bed 
New Mexico, Fig. a, skull from above; 4, do. from left side. Original, from 
€port U, S, Expl. Surv. W, rooth mer., Vol. 1v, G. M. Wheeler. 
the genus Auchenia (llama) has been found fossil within the United 
States, though several have been described. Some or all of these 
long to Holomeniscus Cope, which has only one premolar 
above, while Auchenia has two. A species about as large as a 
large llama has been found in the Oregon desert and named Æ. 
Vilakerianus Cope. Another as large as the largest known camel 
IS the H. hesternus Leidy. This fine species ranged from Oregon 
through California to the valley of Mexico, where it has been 
- found by Professor Castillo of the School of Mines. A still 
larger Species, perhaps of this genus, the H. ca/ifornicus Leidy, must 
have €xceeded in its dimensions either of the living camels. It is 
Known from a few bones from California, and perhaps from Mexico. 
