40 



The mental foramen is smaller than in the tapir, and is situated below the 

 interval of the second and third premolars 



The length of the lower jaw, from its bade border to the fore pari of the 

 second premolar, is 9;] inches, and in the complete condition it measured 

 about 2 inches more. 



Portions of several lower jaws, apparently all referable to Palseosy ops, were 

 obtained by Dr. Corson at Grizzly Bnttcs. The specimens exhibit some 

 variation in character, and may, .perhaps, belong to more than one species of 

 the genus. One of the specimens consists of a dentary fragment containing 

 the true molars and the fangs of the two premolars in advance. The retained 

 teeth are like those previously described, but are in a trifling degree smaller. 

 The series measures 3|- inches. The jaw-fragment nearly agrees with the 

 corresponding portion of the specimen above described, but is of more uniform 

 depth. 



Another specimen consists of a right ramus, without the chin and back 

 part, and broken into three pieces. It contains the fang of the canine and 

 most of those of the molars. The jaw is of more uniform depth below the 

 position of the teeth than in the more complete specimen first described, and 

 more robust than in either of the former specimens. The retained portion 

 of the fang of the canine indicates a larger tooth than existed in the first- 

 described specimen — one, also, that would accord in its robust character with 

 those of the facial specimen referred to Palceosyops paludosus. The presence 

 of the fang of the canine produces a strong bulge at the side of the chin, 

 which appears to have been comparatively feeble in the first-described speci- 

 men. Two mental foramina are situated below the position of the second 

 and third premolars. The first premolar appears to have had a single fang 

 consisting of a connate pair. It was separated from the canine and second 

 premolar by conspicuous intervals, the posterior of which is the larger. A 

 portion of the chin being retained in the specimen, it would appear in the 

 entire condition to form a broad slope defined at the sides by the convexities 

 of the canine alveoli. The rami were completely co-ossified at the symphysis 

 without the suture of union being apparent. 



The remaining specimen consists of a portion of the jaw containing the 

 fangs of the last two molars, and the portion immediately behind extending 

 toward the angle. The dentary portion of the bone is considerably deeper 

 than in the corresponding portion of the preceding specimens. The base 



