24 AGRIOCHOERUS. 
Inches. Lines. 
Height of lower jaw at first temporary premolar. 5 : : : : 7 
Height of angular apophysis he te : > : : ‘ 0 : 10 
Distance from coronoid process to anterior mental foramen 4 4 
Length of upper series of six molars 2 6 
Length of lower series of six molars 2 8 
GREATEST DIAMETER. 
Antero-posterior. Transverse. 
Seventh upper molar . ; : . é s 5 : = 1 lines: 6 lines. 
Sixth upper molar. ; : ‘ : 4 ¢ P . Gear’ R « 
Fifth upper molar sy 5 : . : ; : * Dee See 
Third temporary molar pr Ay ses 
- Second temporary molar pes Sees 
First temporary molar 43“ ihe se 
First permanent premolar 33 “ Tegan 
Seventh lower molar . (Sms 32 6 
Sixth lower molar 63 “ 
Fifth lower molar 5a & 
Third temporary molar Gre Dees 
Second temporary molar Bye ae ae 
First temporary molar Anty‘S dd yee 
AGRIOCHOERUWS, Levy. 
Agriocheoerus antiquus, Leivy. 
(Prats I. Figs. 5-10.) 
Agriochoerus antiquus, Leidy: Proc. Acad. Nat. Sci., 1850, V. 121; Owen’s Rep. of a Geol. Sury. of Wisc., ete., 571. 
Agriochoerus is a remarkable and very peculiar genus of ungulata, representing 
a type which occupies a position in the wide physiological interval existing between 
recent ruminants and the anomalous Anoplotherium. 
It was first established in the Proceedings of the Academy of Natural Sciences 
of Philadelphia, for 1850, upon a portion of a skull, and several fragments of jaws 
with teeth, received from my friend, Dr. Hiram A. Prout, of St. Louis. : 
Of the species characterized under the name of Agriochoerus antiquus, I have 
had the opportunity of studying the following specimens :— 
1. A much mutilated face, with the forehead, and portions of both sides of the 
lower jaw, apparently of an adult individual. The upper jaw contains upon one 
side the posterior five molars, and upon the other side the posterior six molars. 
Both fragments of the lower jaw contain the posterior five molars. The first true 
molar is only slightly worn, while the others have hardly yet been affected by 
trituration. Received from Dr. Prout. (Pl. L., Figs. 5-8.) 
2. Two fragments of the upper maxillz, containing each the last two true molars, 
and a fragment of the lower jaw containing the anterior two true molars. These 
apparently belonged to the same and an older individual than the former. Received 
from Dr. Prout. (Figs. 9, 10.) 
Description of the portion of a Skull_—Viewed from above, the anterior portion of 
the skull is nearly equilateral triangular, the sides of the face converging in a nearly 
