OREODON. ill 
MEASUREMENTS. 
Inches. Lines. 
Breadth of face at infra-orbitar foramina ‘ : 3 Z 4 eee 8 
Distance from infra-orbitar foramina to frontal at ar processes 1 4 
Length of series of upper molars 8 1 
Length of series of lower molars 3 
Length of series of upper true molars . 1 8 
Length of series of lower true molars . 1 10 
16. The skull of a young animal, accompanied by the greater portion of the left 
side of the lower jaw. The end of the nose and superficial portioh of the right 
side of the face are broken away. The upper jaw, on the right side, contains all the 
molars perfect; consisting of the first permanent premolar and the succeeding three 
temporary and two true molars protruded, and the last true molar just on the 
point of protrusion. The portion of lower jaw also contains all the molars nearly 
perfect; consisting of three temporary molars and three permanent true molars, the 
last of which is only partially protruded. 
Independently of the specimen not being adult, it evidently indicates a smaller 
individual of Oreodon Culbertsonii than any of the others previously designated. 
(Plate V. Figs. 1, 2.) 
From the collection of Dr. Owen. 
MEASUREMENTS. 
Inches. Lines. 
Length from occipital condyle to canine alveolus . : : ‘ : en 
Length of series of upper molars 3 1 
Length of series of lower molars 3 
Length of series of upper permanent true molars 1 8 
Length of series of lower permanent true molars if 10 
Antero-posterior diameter of last upper molar 73 
Antero-posterior diameter of last lower molar 5 C : : : : 9 
17. Fragment of the left side of the lower jaw of an old individual, containing 
the true molars and the two premolars in advance, with the characteristic enamelled 
triturating surfaces nearly obliterated. (Plate VI. Figs. 8, 9.) 
From the collection of Dr. Owen. 
MEASUREMENTS. 
Inches. Lines. 
Length of series of true molars : ; ; ; é : : Rei 9 
Antero-posterior diameter of last molar ; : ; 2 : F : 10 
18. Seven fragments of upper and lower jaws, containing true molars, appa- 
rently from six different individuals. 
From the collection of Dr. Owen. 
19. A skull, without the lower jaw, and with the end of the nose and posterior 
part of the cranium broken away. It is particularly valuable from its preserving 
the post-orbital arch entire on both sides. The teeth are all broken. (Plate IV. 
Fig. 3.) 
From the collection of Dr. Hiram A. Prout, of St. Louis. 
