320 MEMOIRS OF THE CARNEGIE MUSEUM 
Pe by diastemata of respectively 8 mm. and 10 mm.” Thinohyus osmonti Sin- 
clair is characterized by the long diastema in front of p,, which is double-rooted 
and in an uninterrupted series with the teeth back of it. ‘“ P? is a single-crowned, 
double-rooted tooth, separated from the canine and p? by diastemata.” The infra- 
orbital foramen appears from the photographic reproduction given by Sinclair to be 
above the posterior part of p®. 
SUMMARY. 
The study of the remains described above may be summarized as follows: 
1. The animals represented by the specimens in the Paleontological Collection 
of the Carnegie Museum are more modified than those representing the John Day 
Miocene in other collections, and the former may, when more completely known 
be regarded as new genera. 
2. The horizon in which the remains were found is the upper part of the Harri- 
son horizon, which is regarded by Hatcher” as filling the hiatus between the Upper 
and Lower Deep River Formations. The uppermost Arikaree, or the Monroe Creek 
horizon, which is regarded by the same author as equivalent to the Upper John 
Day, has not as yet yielded any remains of peccaries. When such remains are 
found in the lower horizons of the Miocene in this locality, they will undoubtedly 
reveal characters more closely allying them to the John Day forms, thus differing 
from Thinohyus siowxensis. 
The writer wishes to express his thanks to Dr. W. J. Holland, Director of the 
Carnegie Museum, for kind suggestions and assistance in the preparation of this 
manuscript for the press. 
The illustrations are from drawings made by Mr. Sydney Prentice. 
CARNEGIE MUSEUM, November 24, 1905. 
1’Sinclair, Bull. Dept. of Geol. Cal. Univ., Vol. IV., p. 110, 1905. 
7 Sinelair, /. c., p. 139. 
18 Proc. Amer. Philos. Soc., Vol. XLI., p. 118, 1902. 
