ree 
Cope.] 560 (Jan. 18, 
Front narrower; internal wall of fourth premolar not com- 
DISA w ores We S Gian a tearolees flarwaoee § LENT ety Aue EMOU URN 
Front wider ; skull shorter and higher ; internal wall of inferior 
Pins fy complete ciievswl bie. LENA EEE Ne TAU TONS 
aa, Foramen infraorbitale above junction of P-m. ii and iii, 
Front medially concave, laterally descending to orbits ; sagit- 
VE CPGRE BOLE. Wives ee ACU elev Nar L Malpas Wi tNiale elbie aco eldadha TRITON, 
II, Otic bullee mammiform with triangular base. 
Front convex ; nasal bones acute posteriorly ; fourth inferior 
premolar complete ; infraorbital foramen above junction of 
Pome HP and dy vv si ss 0. Geo AMV VN MIRCLD SHERI e RPE LIA GA enue” DORUOLC2UICS L 
III, Otic bulle oblong, constricted at the middle, 
Infraorbital foramen above junction of P-ms,. ii and iii; front 
plane ; nasal bones truncate posteriorly ; postglenoid pro- 
CESS, TODUSE nce ecdereserruore see tetany Wb rh NEN WE VCdlnk A, ryderanus. 
Besides the above, Leidy has described an A. major* as near to the A. 
antiquus, but of larger size. Marsh has described a small species from the 
Uinta formation under the name of A. pumilus.| Lydekker figures and de- 
scribes a superior molar tooth from’ India as probably belonging to this 
genus.{ It is stated by him to have been found in the earlier pliocene for- 
mation. If this determination be correct, it represents the latest known 
species, as the A. pumilus of Marsh is the earliest, Owing to incomplete- 
ness in the descriptions of these species I cannot include them in the above 
synoptic table. 
Agriochoerus antiquus Leidy. 
Proceedings Academy Philadelphia, 1850, 121; 1858, 892; 1854, 157; 
1857, 89, Ancient fauna of Nebraska, 18538, p. 24, Pl. I, figs. 5-10. Bronn 
Lethiea Geognostica, 1856, 9383; Leidy Extinct Mammalia Dakota and 
Nebraska, 1869, 182, Pl. XTII, fig. 4. 
White River epoch of Nebraska and Dakota, 
Agriochoerus major Leidy. 
Proceedings Academy Philadelphia, 1856, p. 164; 1857, 89. ? Hucro- 
taphus auritus Leidy, Owen’s Report Geological Survey, 1852, p. 568, 
Pl. XV, figs. 1-8. Ancient Fauna of Nebraska, 1858, p. 56; Pl. VII, 
figs. 1-8. Bronn Lethaa Geognostica, 1856, 931. 
White River formation of Dakota and Nebraska. 
Agriochoerus latifrons Leidy. 
Proceedings Acudemy Philadelphia, 1867, p. 32, Extinct Mamm. 
Dakota, Nebraska, 1869, p. 185, Pl. XIII, figs. 1-8. 
White River epoch of Dakota and Nebraska. 
*Hxtinct Mammalia of Dakota and Nebraska, p. 134, 
+ Amer. Journal Science and Arts, 1875, p. 250, 
| Paleontologica Indica, 
& 
