26 UNITED STATES AND MEXICAN BOUNDARY. 



margin. The profile is mucli the same. The muz 



extending towards the 



the first place, as already remarked, the size of the animal is considerahly less, prohably by 

 about one-fourth. The skull is also broader. Thus comparing No. 995 from the Coppermincs, 

 which is very young, but has all its permanent teeth, with 1220 from Monterey,, in which all 

 the teeth are in place, except the canines, which are about half way out, we find the former to be 

 a very little longer, but with the zygomata .55 apart instead of .52. This difference lies in the 

 size of the temporal fossae, the cranium proper being largest in 1220. The orbital processes 

 are situated farther forward ; the zygoma is longer, especially when measured on its free lower 



ile is narrower and more slender. Viewed 

 laterally^ the muzzle is seen to be lower than in the California grizzly, especially above the 

 malar bone. The malar is much lower anteriorly, and the portion 

 anterior canthns is shorter and narrower. The distance from incisors to end of molars, as well 

 as to end of palate, is half an inch less^ though the animal is older, and the skull a little 



longer. The palate is more Taulted. 



The lower jaw of No, 995 differs from the California specimen in being lower and having the 

 coronoid process longer along its base. The distance from the back of the condyle to the first 

 molar is about one-third the distance to the end of the incissors, instead of one-fourth, as in 

 No. 1220. 



The differences in the teeth of the two specimens are quite appreciable. As a general thing 

 those of 995 are in every way much smaller in all dimensions than in the other, though 

 considerably larger than in TJ. americanus. The three posterior upper molars measure 2.62 

 inches in the one, in the other 3 inches. The chief disproportion is in the posterior molar. 

 This molar has the usual three tubercles or lobes along the inner edge and the two outer ones ; 

 instead of having the posterior half of the tooth behind the second outer and exterior to the 

 second and third inner tubercles, stoping obliquely outwards and upwards, and with a general 

 wrinkling of the enamel only^ there is a third outer tubercle midway between the middle one 



and the posterior extremity of the tooth. 



(which 



so high as those anterior to it) is occupied by a few enamel granules. The space between the 

 two marginal series of tubercles is much less. The third upper molar from the end is broader. 

 As in other species the crown of this tooth is divided longitudinally by a deep ravine, exterior 

 to which is a series of two-pointed and trenchant tubercles, the posterior one of which exhibits 

 a supplementary notch behind. The inner side of this ravine is occupied by a series of low 

 tubercles, separated by furrows, both on the summit and inner side of the tooth ; the central 

 tubercle rather longest. In the other skull there is but a single trenchant or compressed 

 tubercle, without any trace of subdivision. 



The lower molars are very similar in the two specimens, except that they are smaller and 

 narrower in No. 995. In both the posterior molar is triangular, the base anterior ; in No. 995, 

 bcwever, the width is about three-fourths the length, and the whole tooth is considerably shorter 

 than the second in advance of it, instead of being nearly equal, as in the Pacific specimen, where, 

 also, the width of the tooth is little more than half the length. 



The comparison of large siulls brought in by the Boundary Commission with corresponding 

 ones from the California coast exhibits much the same differences as to the teeth ; the bi-lobed or 

 tri-lobed character of the inner half of the first large upper molar being maintained^ as also the 

 proportional inferiority in the size of the teeth^ and the short longitudinal dimensions of the 



n 



