128 Bulletin American Museum of Natural History. [Vol. X, 



metapodials are firmly coossified. The size of the species is 

 about equal to that of PochrotJieritiiii hiluatmii of the White River. 

 The reference of this species to Fliauchenia is of course only 

 provisional, and until the entire dentition is known the reference 

 is uncertain. If it should transpire that the first jjremolar is 

 absent it could not be placed in Pliaitclienia, but would occupy a 

 position between this genus and Auchenia. 



Pliauchenia spatula Cope. 



This species is founded upon an unusually complete lower jaw 

 from the Blanco beds of Texas. According to Cope it is one of 

 the largest Camels yet found, and considerably exceeds the 

 modern Dromedary in size.' A comparison of the measurements 

 of the three known species will exhibit the striking difference in 

 size ; they are as follows : 



/*. spatula. P. humphresiatia. P. ininhua. 



.MM. .MM. MM. 



Length of last two pms. and ms. . . . i88 no 70 



Camelops Lcidy} 



Camel remains in the Pleistocene, Equus Beds, are very 

 numerous ; they have been found in nearly every State and 

 Territory west of the Mississippi River, and are, in places, 

 exceedingly abundant. Unfortunately, however, in most 

 instances the fossils are so fragmentary that it is impossible to 

 determine the genus or species to which any given specimen is to be 

 referred. This fact has been taken advantage of, it appears to 

 me, to inordinately multiply the genera and species, upon no 

 better ground, frequently, than mere guesswork. These remains 

 have been grouped at different times in no less than five distinct 

 genera and ten species. The first of these genera, Camelops, was 

 proposed by Leidy (Proc. Acad. Nat. Sci. Phila., 1854, p. 172), 

 upon the fragment of an upper jaw of a large Camel from the 

 gravel drifts of Kansas. The second genus, Megalomeryx, was 

 also proposed by Leidy (Proc. Acad. Nat. Sci. Phila., 1858, p. 

 24), for the reception of some large teeth supposed to belong to 

 an extinct Camel, from the Pleistocene of Nebraska. In 1872 



' Proc. Acad. Nat. Sci. Phila., 1854. p. 172. 



