1898.] IVorimaii, Extinct Camclidce of North America. 133 



certainly not those of any Auchoiia with which I am familiar, 

 since they entirely lack the antero-external buttress of this genus 

 and agree with those of Camelops. I cannot see any reason 

 whatever to regard this jaw as belonging to a species different 

 from that represented by the upper molars above noticed. The 

 size of the species is near that of the living Ai/c/iciiia, and is hence 

 much smaller than C. kansanus, the only character to my knowl- 

 edge by which it can l)e distinguished. 



Camelus americanus, 



sp. nov. 



From the Pleistocene Beds of the Hay Springs locality were 

 obtained by the Museum expedition last year several specimens of 

 a Cameloid apparently different from anything hitherto described 

 from this country. One specimen consists of the greater part of 



Fig. 21. Lower jaw of Camcliis americanus^ .side view. 



both rami of the mandibles of a fully adult individual, in excellent 

 state of preservation, but broken in such a manner as to display 

 but little of the jaw posterior to the last molar. The second 

 specimen consists also of a mandibular ramus, but the individual 

 was young, in which the milk molars had not yet been shed. 



The inferior dental formula of the adult specimen is as follows: 

 I3, Cy, Pnis) J^3- This it will be noticed is the dentition of the 

 genus Camelus, from which I cannot distinguish it generically at 

 present. If this is a true Camelus, as I suspect, it is the first time 

 that it has been found in the western hemisphere. 



The incisors display the usual spatulate cameloid pattern, and 

 are very procumbent in position. Almost immediately behind 

 the third incisor follows a rather weak incisiform canine. At the 

 posterior termination of a comparatively short diastema is placed 



