1872] 487 [Cope. 
D NOTICE OF EXTINCT VERTEBRATES FROM BITTER 
CREEK, WYOMING. 
By Epwarp D. Corn. 
SECC 
(Read before the American Philosophical Society, Sept. 19, 1872.) 
PALAOSYOPS VALLIDENS. Cope. Sp. nov. 
Represented by the dentition of one maxillary bone with other bones 
of one individual; a portion of the same dentition of a second ; with 
both rami of the mandible with complete dentition of a third. The spe- 
cies is distinguished by the details of the dental structure, and by the 
superior size. It exceeds, in this respect, the Palwosyops major, Leidy ; 
while the three posterior lower molars measure 4.5 inches in length, the 
same teeth of the present animal measure 5.25 inches. The last superior 
molar of another specimen measures 2 inches in length ; in the third the 
first true molar is 1.5 inch in length, while the last inferior molar is 2.25 
inches long. The peculiarity in the structure of the superior molars consists 
in the existence of two strong transverse ridges, which connect the inner 
tubercle with the outer crescents, enclosing a pit between them. These 
are most marked on the premolars, where also is found the peculiarity of 
the almost entire fusion of the outer crescents into a single ridge. These 
united crescents are narrower than in P. major, and the summits of all 
the crescents are relatively more elevated. The number of inner tubercles 
is the same as in that species; all the teeth have very strong basal cin- 
gula, which rise up on the inner tubercle. The last inferior molar is 
relatively narrower than in P. major, and the posterior tubercle is larger 
and longer, and is an elevated cone. 
This species is, after those next described, the largest mammal of the 
Wyoming Eocene. 
LoxoLOPHODON. Cope. 
(Proceed. Amer. Philos. Soc., Feb. 16, 1872. 
The discovery of the remains of numerous animals of this genus, con- 
firm the propriety of its separation from Bathmodon. The characters are 
as follows : 
Type of extremities Proboscidian. Femur without third trochanter, 
toes short, stout. Dentition: 1.1; C.0; P.M.4; M.2. The premax- 
illary is at the posterior margin of that bone, and is a large recurved 
trenchant tusk. There is a long edentulous interval between it and the 
first premolar, which is smaller than the others. These support an outer 
crescent and a small inner tubercle. In the anterior premolars, the cres- 
cent is nearly straight, in the posterior more curved. With use, the cres- 
cent and tubercle wear together and form a short lance-head surface. 
The crescent is angular, and occupies the whole crown in the molars, and 
the tubercle is small and not symmetrically placed. The teeth on the 
maxillary bone are remarkably small for the size of the animal. Lower 
jaw not observed. 
The cranium presents a remarkable appearance on account of the pro- 
