APPENDIX. 
Art. XLIX.—WNotice of New Tertiary Mammals. Il; by 
O. C. MARSH. 
Among the remains described in the present paper are those 
of several Hdentates, the first detected in this country in the 
Tertiary formation. The numerous extinct species of this 
order previously known, both from North and South America, 
are all from more recent deposits. 
Morotherium gigas, gen. et sp. nov. 
tions resembles that of Megalonyx Jeffersonii Harlan. The head 
of the femur is hemispherical, but slightly expanded in an 
antero-posterior direction. The great trochanter is massive, 
what recurved, and encloses adeep pit, as in the elephant. The 
third trochanter is represented ols 
the lower half of the shaft. On the posterior surface, there is a 
face for the patella is broad and shallow, and is separated by a 
deep groove from each of the condyles ; the inner groove eet 
about twice the width of the other. The humerus is expand 
at its distal end. The olecranon cavity has little depth, and 
there is no perforation above the inner condyle. The latter 
its articular face concave transversly, as in Mylodon. The 
outer and inner deltoid ridges unite below, terminating In & 
double tuberosity. 
