572 ARCH MH OTHERIUM—ANCHITHERIUM—TESTUDO. 
It was established in the Proceedings of the Academy of Natural Sciences, vol. 
v., p. 121, for 1850, upon the anterior portion of a skull, containing in both jaws 
nearly all the molars received for examination from the Smithsonian Institution. 
The molar teeth are decidedly constructed upon the same pattern as those of 
modern Ruminants, and the true molars are most like those of the extinct Meryco- 
potamus, Falconer and Cautley, of the Sivalik Hills of India. The orbits, however, 
are not closed behind, as in the latter and existing Ruminants, but are open, as in 
Anoplotherium. 
ARCHAOTHERIUM ROBUSTUM.  Leidy. 
Arctodon : Proc. Acad. Nat. Sci., vol. v., p. 278. 
This second species of Archzotherium is founded upon several fragments of 
molar teeth, and the crown of a canine which belonged to a larger animal than the 
Archeotherium Mortoni. The portions of teeth resemble so much those corre- 
sponding to them in the Bear, that I thought they certainly belonged to a closely 
allied genus, but was undeceived by an examination of the very beautiful specimen 
of a head containing nearly all the molars of Archzeotherium Mortoni, in the col- 
lection of Dr. Owen. 
ANCHITHERIUM BAIRDIL.  Leidy. 
Paleotherium Bairdii: Proc. Acad. Nat. Sci., vol. v., p. 122. 
Cuvier described the remains of a pachydermal quadruped, which he named 
Palzotherium aurelianense. This has since been certainly determined by the 
researches of Lartet, De Christol, and Pomel, to be a solipedal animal, for which 
the generic name of Anchitherium had been proposed by Von Meyer, and the 
species should therefore be named Anchitherium aurelianense. Among the remains 
of Mammalia from Nebraska, loaned to me for examination by the Smithsonian 
Institution, is the greater portion of a cranium, and fragments of jaws, containing 
full series of both upper and lower molar teeth, and a first phalanx. : 
The latter undoubtedly indicates a solipedal animal, and the molar teeth have 
the exact construction of those of Anchitherium aurelianense, to which, in com- 
parison, the Anchitherium Bairdii was about three-fifths the size. 
TESTUDO LATA.  Leidy. 
Proc. Acad. Nat. Sci., vol. v., p. 173. 
This, the largest of the fossil Turtles from Nebraska, was established upon a 
specimen consisting of the greater portion of a carapace and sternum, in the col- 
lection of the Smithsonian Institution. It has been about two feet in length, 
twenty inches in breadth, and about nine inches in height. 
