OREODON. AT 
The specimen agrees with the preceding, except that the face is more flat above 
so as to appear of less depth, and in transverse section more square. 
From Messrs. Culbertson’s collection. 
MEASUREMENTS. 
Inches. Lines. 
Breadth of face at infra-orbitar foramina. . . ; : : ware 6 
Breadth of face above the first premolar. : : Same 6 
Height from infra-orbitar foramina to angular processes of os oats é Bieta! 23 
Breadth of ossa nasi between the points of the latter processes : : : 113 
5. A portion of a very much mutilated skull, with attached fragments of both 
sides of the lower jaw widely extended from the upper teeth. Upon one side the 
specimen contains all the upper true, and the lower posterior two true molars, and 
on the other side the upper posterior two and the last lower molar teeth. 
From Messrs. Culbertson’s collection. 
MEASUREMENTS. 
Inches. Lines. 
Length of series of upper true molars : i ‘ F : ; scammed! 11 
Antero-posterior diameter of the upper last molar : : ; : : 10 
Antero-posterior diameter of the lower last molar 2 ; : c a seal 
6. A fragment of the right side of the face of a young animal, containing a 
portion of the first, the entire second, and the inner portion of the third temporary 
molars, and the succeeding two permanent molars. 
It was this specimen to which I applied the name Cotylops speciosa, erroneously 
supposing it to be distinct from Oreodon. 
From Capt. Van Vliet’s collection. 
7. Thirteen fragments of upper and lower jaws, all containing from one to 
three true molars, except one, in which are preserved the anterior two lower pre- 
molars. They apparently belonged to seven different individuals. 
From the collections of Dr. Owen, Capt. Van Vliet, Dr. Prout, Prof. O’Loghland, 
and Messrs. Culbertson. 
8. A portion of the right side of the lower jaw of a young animal, with the 
remains of the anterior two temporary premolars; the entire temporary true molar, 
considerably worn; and the succeeding two permanent molars. (Pl. VI. 10, 11.) 
From the collection of Capt. Van Vliet. 
9. A nearly entire skull, comparatively slightly fractured, and wanting only 
the end of the nose anterior to the canines, the upper of the latter, the incisors, 
zygomata and post-orbital arches, a portion of the parietal crest, and the right angle 
of the lower jaw. ’ 
Its details of form vary in a very slight degree from those of specimen 1. In 
the latter, it was observed in the table of measurements, a hiatus of one and a 
