No. 2328. PLEISTOCENE VERTEBRATES IN UNITED STATES— HAY. 123 



Diagnosis. — An animal of medium size. First lower molar as in 

 Auchenia, except that the anterior outer style is missing. 



In the collection from Afton there are found three teeth which 

 are regarded as having belonged to a species of camel. It has 

 further been found impossible to refer these teeth to any of the 

 hitherto described species; hence a new name is proposed. 



The teeth belong to the left side and are identified as the fourth 

 premolar and the first and second molars. They belonged certainly 

 to as many individuals. The premolar (Cat. No. 9110) is much worn 

 (pi. 7, figs. 7, 8). It retains both roots. The length is 18 mm.; the 

 width, 9.1 mm. On the inner face is shown a deep sulcus, in front 

 of which the tooth is bent somewhat inward. It was at first con- 

 €luded that this premolar might be referred to Camelops inacroce- 

 jyhahis (Cope) ; but the length is too great, and in that species the 

 anterior part is straight, not incurved.^ The hinder end is deeply 

 notched by wear against the first molar. The tooth taken to be the 

 first molar (Cat. No. 9111) is only moderately worn and is in good 

 condition of preservation (pi. 7, figs. 3, 4). The roots are broken 

 off and there is a considerable pulp cavity, now filled with clay. The 

 height of the crown is 26 mm.; the length at about half the height 

 of the crown, 26 mm. ; the width at the base, 23 mm. On the inner 

 face there is a rather deep groove between the two lobes and opposite 

 the outer groove. The inner and outer grooves are only slightly 

 separated. In front of the inner groove there is a well-developed 

 rib, as there is in the llama. According to Cope, as cited, this rib 

 is not present in the first molar of Camelo'ps macrocephalus^ but is 

 present in the second molar. On the inner face there is a narrow 

 style along the front of the tooth and a broader one along the rear 

 of the hinder lobe. The tooth resembles closely that of the llama, 

 but does not have the prominent fold found on the anterior border 

 of the outer face of the tooth. The tooth identified as the second 

 molar (Cat. 9112) is only slightly worn (pi. 7, figs. 5, 6). The 

 height of the crown is 45 mm. ; the length, taken at the base, is 24 

 mm. ; at half the height, 25 mm. The tooth differs in some ways from 

 the first molar and possibly belongs to another species. There is 

 hardly that difference in size that might be expected. The anterior 

 inner style is more prominent than in the first molar, while the rib 

 in front of the internal groove is hardly perceptible in the lower half 

 of the crown. As will be observed from the figure of the inner face, 

 the hinder lobe is shorter fore and aft than the anterior lobe; but it 

 is possible that this is abnormal and due to pressure on the pulp be- 

 fore calcification. 



1 Cope, Rep. Vert. Taleont., Llaro Estacado, 1893. p. 86, pi. 23, fig. 5. 



