ON SOME NE\y AND LITTLE KNOWN CEEODONTS. 
1G« 
Measurements. 
Metacarpal IV, length, . . • 
“ “ breadth, “ ‘ . 
“ V, length, 
“ “ breadth, “ “ •. 
Phalanx, length, proximal (lateral digit), 
“ “ median, “ “ 
“ “ ungual, “ 
Pelvis, length. 
Ilium, length, 
“ width (greatest), . 
Ischium, length, . 
Acetabulum, diameter, . 
Tibia, length, 
“ breadth proximal end, 
“ “ distal “ 
Fibula, length, 
“ breadth proximal end, . 
“ “ distal “ 
Tarsus, height (from astragalus), 
“ breadth, . 
Calcancum, length. 
Astragalus, “ 
“ breadth, 
CulK)id, length. 
Metatarsal III, length, . 
“ V,’ 
Cerebral hemispheres, length, 
■■ “ greatest breadth, 
Olfactory lol)es, length. . 
■' breadth. 
Cerebellum, breadth, 
(Measurements marked (?) are approximate only.) 
M. 
.065 
.010 
.050 
.014 
.023 
.012 
.016 
.205 
.115 
.046 
.090 
.027 
.205 
.042 
.025 
.191 
.011 
.017 
.046 
.039 
.056 
.031 
.018 
.013 
.070 (?) 
.076 (?) 
.068 
W a 
M. 
.064 
.012 
.039 
.009 
.019 
.020 
.062 
.054 
.024 
.040 
.064 
II. Mk.soXY.\ (?) Ul.NTE.NSIS, sp. nov. 
I he first s|MH'iinens of flesh-eaters known from the Uinta formation are portions of 
three hulividntils rolleeted by the Princeton Expedition of 1886. One of these, con- 
sisting ol an incisor, portions of a canine, one upper and two lower premolars and three 
lower molars, and portions of the mandible, is doubtfully referred to Mesonyx, and 
differs from all known species in its very much greater size, and in the reduction of 
the anterior tubercle of the molars. The incisor is peculiar and consists of a broad 
ami roumled simple crown ; it is of large size and contrasts strongly with the incisors 
of the Pridger sin-cies. The canine is very large ; the upper premolar differs from the 
corresiKinding tooth of the Bridger species only in size. The lower premolars are much 
smaller than the molars and are composed of a compressed cone with anterior and pos- 
terior ba.sal cusps ; the posterior cusp is much less developed than in the other species of 
Me^nyx, thus making a much greater difference in shape between the molars and 
premolars. In the Bridger species all of the inferior molar series are essentially alike. 
Tlie molars are very large and consist of two lobes, of which the anterior is a heavy, 
