No. 2328. PLEISTOCENE VERTEBRATES IN UNITED STATES— HAY. 121 



same species as E. compUcatus) ; but there are many characters in 

 the way of regarding the Afton teeth as belonging to this species. 

 The teeth of specimens of E. scotti in the American Museum of 

 Natural History, from which the writer has a squeeze of the left 

 cheek teeth of No. 10628, have the enamel strongly plicated ; the post- 

 protoconal valleys of the premolars have deep inlets at the head, and 

 they are directed nearly toward the outer anterior corner of the 

 tooth. The axis of the protocones is also oblique. In the molars the 

 valley mentioned is turned more toward the inner side of the tooth 

 and the protocones are nearly parallel with the axis of the tooth row. 

 In general the teeth from Afton are not greatly different in size 

 from those of E. ocddentalis;^ but, according to Merriam's meas- 

 urements, the width of each tooth is less than the length of the 

 grinding surface ; while in E. holmesi the width at least equals the 

 length. The plication of the enamel of the f ossettes in E. occidentalis 

 is still simpler than in E. holmesi. In many respects the teeth from 

 Af-ton resemble those teeth from Silver (or rather Christmas) Lake, 

 Oregon, which were described and figured by Gidley.^^ In those 

 teeth, however, the enamel of the fossettes is far more complicated 

 than in the teeth from Afton. For the present, therefore, it is 

 thought best to apply a new name to the latter. This is given in 

 honor of Prof. W. H. Holmes, in recognition of his contributions to 

 geology and anthropology. 



Family CAMELIDAE. 



CAMELOPS K,4NSANUS? Leidy. 



To this species are provisionally referred five teeth. All appear to 

 be thoroughly fossilized and are stained blue or black. An upper 

 left first molar belongs in the department of anthropology. It is 

 only slightly worn. The type of C. kansanus had no teeth and the 

 teeth that have been referred to this species may belong to other 

 species. The Afton teeth are here compared with teeth of C. huer- 

 fanensis (Cragin). They belong possibly to this species. Measure- 

 ments in millimeters of this tooth and the corresponding one of the 

 type of C. hucrfancnsis are presented. 



MEASOEEMENTS OF UPPER FIIiST MOLARS. 



Length of crown at base 



Length of crown 35 mm. above base. 

 Width of posterior lobe at base 



iMerriam, J. C, Bull. Dept. Geol. Univ. Calif., vol. 7, p. 410. 

 "Bull. Amer. Mus. Nat. Hist., vol. 14, 1901, p. 116, fig. 11. 



