320 Bulletin American Museum of Natural History. [Vol. XVI, 



is much more swift-footed and more advanced in dentition 

 than is the modern peccary, and may be supposed to have 

 lived more in the open. Prairie-dogs, gophers, and field-mice 

 are now to be found on the plains in the same region, and 

 muskrats along the streams. Of the habits of Mylodon we 

 know little; perhaps it, like the mammoth, frequented the 

 watercourses and valleys of open country, rather than the 

 denser forest regions which were the home of the contem- 

 porary mastodons. The Castoroides remains are too fragmen- 

 tary to tell whether it was the same as the eastern species. 



Silver Lake (Lake Co.), Oregon. ^ 



Canis ? latrans, jaws, limb- and foot-bones. 

 Canis, of. occidentalis, limb- and foot-bones. 

 Vulpes, cf. pennsylvanicus , femur and tibia. 

 Lutra canadensis , front of skull, jaws, limb-bones. 

 Fiber zibethicus, jaws, limb-bones. 

 Arvicola sp. div., jaws, limb-bones. 

 Thomomys sp., skeleton nearly complete. 

 Geomys sp., jaws, limb-bones. 

 Castor sp., one molar. 

 Castoroides sp., teeth. 



Lepus sp. (cf. campestris) , parts of jaws, limb-bones, etc. 

 'Mylodon sodalis Cope (? = M. harlani), phalanges. 

 Equus pacificus, numerous bones from all parts of skeleton. 

 Elephas primigenins ? columbi, teeth, foot-bones, vertebrae, 

 etc. 



Platygonus , cf. vetus, teeth. 



Platygoniis sp. minor, teeth. 



Eschatius conidens, parts of jaws. 



Camelops kansanus, parts of jaws, limb- and foot-bones. 



Camelops vttakerianus , upper jaw, ? foot-bones. 



? Camelops sp. max., teeth, foot-bones, etc. 



Antilocapra, fragments of feet. 



With the above mammalia were found numerous bird re- 

 mains, which have been studied by Dr. Shufeldt. 



^ Revised from Prof. Cope's list. 



