46 Annals of the Carnegie Museum. 



left maxillary, the base of the zygomatic arch, both upper canines, 

 one incisor tooth, and other fragments of teeth. The upper incisor is 

 robust, laterally compressed, with a short and thick fang and the 

 crown heavily enameled and striated. The canine is likewise flattened 

 and the crown deeply striated. The maxillary is broken off in the 

 region of P-, but it is evident that the tooth had two roots and occu- 

 pied a crowded and oblique position in the alveolar border, differing 

 thus from L. venis. P- is represented by two stout fangs, while P- 

 has the crown complete. The main cusp of the latter is conical and 

 rather blunt. At the antero-internal angle there is a minute basal 

 tubercle, while posteriorly there is a basal heel of considerable size as 

 in L. verus. P- has the triangular outline due to the prominent 

 deuterocone characteristic of the genus. The anterior external tub- 

 ercle of this tooth is unusually well developed, while that of the oppo- 

 site tooth, though better developed than in L. verus, is of considerably 

 smaller size. The median and postero-external cusps are much worn 

 down, indicating the senility of the animal. On comparing P- with 

 that of Limnocyon potens Matthew, it is at once observed that the 

 anterior and posterior cusps of the crown are proportionally smaller 

 than in that species. 



All the inferior premolars are crowded in the specimen under con- 

 sideration and they carry deep vertical striae. Pj- is represented only 

 by its roots in the left mandible, this tooth in the right mandible 

 having dropped out and the alveole having been partly closed before 

 the death of the animal. The second, third, and fourth premolars 

 have only a slight indication of an anterior basal tubercle as in L. 

 potens,^ while posteriorly there is a considerable cusp. Cingula are 

 feebly or not at all represented. The trigonid of Mj is much worn 

 and is otherwise incomplete posteriorly; the heel is rather large and 

 slightly basin-shaped. The trigonid of My is entirely broken off, 

 but the heel is quite complete, and shows a sharp inner face and a more 

 obtuse elevation along the external margin of the heel. 



The vertebral column is represented only by a few centra, which 

 appear to be very small in proportion to the remains of the head. 

 The tail was robust, as is shown by two or three centra from the proxi- 

 mal region. 



The limb-bones, even more than the remains of the vertebral 

 column, appear disproportionately small, and it was with some hesita- 



■• In L. polens the anterior premolars are larger, while P^ is proportionally smaller. 



