1 898. J Wortman, Extinct Camelidce. of North America. I31 



number of premolars nor the character of the lower molars. It 

 agrees so well in size and character, however, with the corre- 

 sponding parts of other specimens from different localities in 

 which the dentition can be accurately determined, that there can 

 be very little doubt that they belong to one and the same species. 

 The type of Megaloiucryx niohrarensis consists of lower molars 

 from the sand hill region of Nebraska ; and since they do not 

 present any characters which will serve to distinguish them from 

 the corresponding teeth of C. kansanus they may be safely 

 regarded as belonging to the same species. In the same way the 

 teeth described by Leidy from California under the name of 

 Auchcnia hesterna present no differences, either in size or 

 structure, that would lead one to consider them as belonging to a 

 distinct species. Auchenia huerfanensis of Craigin comes appar- 

 ently in the same category and does not differ, so far as can be 

 made out from the description, from C. kansanus. Neither can 

 one detect any characters in the type of Holomenisciis sidcatiis of 

 Cope from the Pleistocene of Texas that separate it from the 

 above species. Cope described a sulcus upon the inner face of 

 the lower molars, which he thought distinguishes this species. 

 Upon careful comparison I find this sulcus is quite as well devel- 

 oped in many other specimens, the reference of which to C. 

 kansanus there can be no reasonable doubt. I find it to be a 

 character which not only varies with the state of wear of the 

 tooth but is subject to a considerable degree of individual 

 variation. 



The dentition of the species thus considered is as follows : 

 I^, C|, Pm-y", Mf. In size the majority of the specimens about 

 equal the corresponding parts of the Dromedary, although some 

 are notably more robust, while others are decidedly more slender. 

 In fact, there appears to be a very great range, as far as size is 

 concerned, in certain bones, especially those of the feet. The 

 length does not seem to vary so much as the degree of robustness, 

 and this probably is due to differences in sex and age. I give here- 

 with the measurements of some of the principal limb bones of this 

 species from the Pleistocene sand beds near Hay Springs, 

 Nebraska, collected by the Museum expedition during last 

 summer. These bones, it is proper to remark, pertain to many 



