GEOLOGICAL SURVEY OF THE TERRITORIES. 353 



the existing species, and had a proportionately longer and narrower 

 muzzle. Several teeth found in the niiocene deposit of Monmouth 

 County, New Jersey, I suspect to belong to the same. 



A few remains found in Maryland, Virginia, and South Carolina ap- 

 parently indicate a species smaller than the collared peccary. It has 

 been named Dicotyles lenis. 



PLATYGONUS. 



This name has been given to an extinct genus of peccary-like ani- 

 mals which appear to have been abundant during the post-pliocene 

 period. Numerous remains of a species, the Platygonus compressus, have 

 been found in the lead-bearing crevices of the cliff limestone at Galena, 

 Illinois. An entire skull, as fresh in appearance as if taken from a liv- 

 ing animal, and of the same species, was discovered as early as 1805, 

 in a cave in Kentucky. Remains have also been found in Iowa. 



ELOTHERIUM. 



This is an extinct genus of suilline animals, originally characterized 

 by remains discovered in the miocene tertiary deposits of France, and 

 was first described in 1847. Its nearest allies now living are the hog, the 

 peccary,and the hippopotamus. The remains of two and perhaps three 

 species of the genus have been found in the miocene deposits of the 

 mauvaises terres of Dakota. 



Elotherium Mortoni. — The remains from upwards of a dozen individ- 

 uals of this species have come under the notice of the writer. It was 

 about the size of the domestic hog. The skull bears some resemblance 

 to that of the latter animal. Capacious temporal fossae for the accom- 

 modation of powerful muscles, separated by a median crest, give the 

 cranial portion of the skull a decidedly tiger-like aspect. The strong 

 jaws are provided with a full series of seven molars, a canine, and three 

 incisors on each side above and below. 



The pointed character of the latter teeth, the long, bear-like canine 

 teeth, and the conical premolars, probably indicate at least a partially- 

 carnivorous habit. The true molars or grinders approach in character 

 the corresponding teeth of the living suilline animals. 



The species was named in honor of the late Dr. S. G. Morton. 



Motherium ingens. — The second species, about a third longer than the 

 former, is founded on a few jaw fragments and teeth obtained by Pro- 

 fessor Hayden in the mauvaises terres. 



Elotherium superbus. — A third species, even larger than the former, 

 indicated by an incisor tooth, from Douglas Flat, Calaveras County, Cali- 

 fornia. The specimen was submitted to the writter by Professor J. D. 

 Whitney. 



PER0HO3RUS. 



An extinct genus allied to the peccary. It is indicated by small 

 fragments of jaws and teeth, from the miocene tertiary deposit of the 

 mauvaises terres of White River. 



Perchoerus probus. — The species thus designated was about the size of 

 the living Dicotyles labiatus of South America. 

 .23 a 



