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ART. XIV. — Description of some remains of extinct Mammalia. 

 By Joseph Leidy, M. D. 



Camelops Kansanus, Leidy. Proc. Acad. Nat. Sci., vii, 172. 



This genus and species are established upon a fragment of the anterior extremity of 

 an upper jaw of an animal of the camel family, discovered by Mr. Henry Pratten, of 

 New Harmony, Indiana, in the gravel drift of Kansas Territory. 



The specimen consists of portions of the left maxillary and intermaxillary bones, 

 the latter of which contains the fang of a transformed incisor or functional canine 

 tooth, as in the lama. 



The intermaxillary bone is of very much more robust proportions than in the lama 

 or camel. Its upper part and outer surface form the segment of a slightly flattened 

 cylinder, and from the nasal side to the outer side of the aperture of its alveolus it 

 is an inch in breadth, while in the lama in the same position it measures only the 

 third of an inch, and in the camel about half an inch. The inclination of its nasal 

 border approaches more the horizon than in the lama or camel, apparently indicating 

 the animal to have possessed a lower and perhaps a longer face than in either of the 

 latter genera. The gingeval border is rugged as in its congeners, and it presents two 

 irregular pits, apparently the alveoli of incisive germs. 



The fang of the functional canine contained in the intermaxillary bone is laterally 

 compressed conical, and is an inch and a half in length. From the orifice of its 

 alveolus it is strongly curved upward and backward, nearly on a line parallel with 

 the curved palatal margin of the bone. The crown of the tooth was directed 

 downward and outward ; and at the base it is ovate in section, with the narrow end 

 posteriorly ; and it measures six lines and three fourths wide, and three lines and 

 three fourths transversely. A small portion of remaining enamel indicates this to, 

 have been thin and smooth. 



The small remaining fragment of the maxillary bone attached in the fossil exhibits 

 at its broken margin the portion of an alveolus, situated an inch and three fourths 

 behind the tooth contained in the intermaxillary bone. It has been about four lines 

 in transverse diameter, apparently had a direction curving downward, forward, and 

 outward from its bottom, and probably accommodated a true canine tooth, although 

 the position is unusually far back, a necessary condition however in the Camelops, 

 from the distance to which the fang of the functional canine tooth extended backward. 



The margin of the hiatus between the alveoli indicated is subacute and concave ; 

 and it measures one and three fourths of an inch in length. It is divided about the 



