250 O. C. Marsh—New Tertiary Mammais. 
They are, moreover, of larger size, and to this the proposed 
name refers. : 
Agriocherus pumilus, sp. nov. 
A number of specimens of a selenodont Artiodactyl, from 
the upper Eocene, agree so nearly with the known remains 0 
Agriocherus Leidy, that the species they represent may pro- 
visionally be placed in that genus. They indicate an animal 
less than one-half the size of the species already described. 
The teeth preserved agree in structure essentially with those of 
A. latifrons Leidy. The temporal fossee were separated only by 
a sharp crest. Nothing has been known hitherto of the skele- 
ton of this genus, but fortunately some of the more important 
bones were found with the teeth of the present species. Th 
show that the feet are of the true Artiodactyl type, and some 
what resemble those of Oreodon. The tibia and fibula are dis 
tinct. The navicular and cuboid are separate. The metapodial 
bones are not united, and the second and fifth were present. 
Measur : 
Extent of last three lower molars, en ge een > mm 
Antero-posterior diameter of penultimate lower molar,.. 10° 
Transverse diameter, .__. ___- SS eraee Sg at 8: 
Transverse diameter of humerus at distal end, -- - - -- -- 24° 
Transverse diameter of articular face, .__.._.--------- 17 
Sient version! Gismiebet yoda hh acs a 115 
Transverse diameter at distal end, _...........------- 16° 
Antero-posterior diameter,. .<....... .2-2+.-2----+++- 15° 
Extent of three upper true molars (second specimen),-- 32” 
Antero-posterior diameter of first upper molar, -- -- -- -- 9°5 
rs OR a cw kene e iV 
Antero-posterior diameter of second upper molar, - - -- - - Ib 
eeeraee inte ee oe ec. et 13° 
The present species was about three-fourths the size ae 
Collared Peccary (Dicotyles torquatus). The specimens descr! 
are from the upper Eocene of Utah. 
Yale College, New Haven, Feb. 20, 1875. 
