ere S eS ee ee 
0. C. Marsh—Notice of some new Fossil Mammals, ete. 85 
Art. VIIEL—WNotice of some new Fossil Mammals from the Tertiary 
Formation ; by Professor O. C. Marsu of Yale College. 
In association with the Reptilian fossils collected by the 
Yale College party last summer, and already described in this 
Journal,* numerous remains of Mammals were also discovered, 
and in the following article some of the more interesting new 
species are briefly characterized. A few species from the other 
ertiary lake-basins of the Rocky Mountains have been included, 
as they throw considerable light on the ancient sub-tropical fauna 
of that region, e€ present notice is merely preliminary to a 
full description, with illustrations, now in course of preparation. 
Titanotherium ? anceps, sp. nov. 
material clears up the question of its exact affinities 
I'he specimens discovered, which evidently pertained to three 
different individuals, mainly consist of several dorsal vertebra, 
the distal end of a humerus, the greater portion of a tibia, and 
some of the smaller bones of the extremities. They indicate a 
Pachyderm, much larger than any other known mammal from 
the same deposits, and about two thirds the size of Titanothe- 
rium Prouti, from the Tertiary basin east of the Rock Moun- | 
tains. The anterior dorsal vertebre preserved have both articu- 
lar faces slightly concave, thus distinguishing the species at once 
from 7. Prouti, which has in this part of the series the front ver 
tebral face very convex, and the posterior face concave. Another 
marked difference is seen in the tibia, which at its proximal end 
has the femoral articular surfaces contiguous, with no prominent 
elevation between them, resembling in this respect some of the 
Proboscidea. 
° 
Measurements. 
sich of anterior dorsal vertebra, on lower sur- 
, 2 inches 2 lines. 
Width of posterior face between rib cavities,.... 3 “ 
Height of posterior face, ee Ve eee aes 
Transverse diameter of tibia at proximalend,...4 “ 10 “ 
Fore and aft POR ene { 4.5 6 
Verse diameter at distal end, -_ ---------- tes > En 
Fore and i s « “ 
* Vol. i, 1871, pp. 192, 322, and 447. 
