230 GEOLOGY. 



latter fit exactly into the depressions or holes found on opposite 

 sides of the specimen. No doubt these animals had a fight in some 

 of the beautiful valleys that drained into this Miocene lake, and 

 then, after their death, their bodies were carried into it by some 

 flood. Closely allied to the last was the saber-toothed weasel, so- 

 called because the number and disposition of its teeth were the 

 same as that of the weasel. Leidy called it Dinictis. It differed 

 from the Drepanodon principally in the possession of two additional 

 molar teeth to the lower jaw. This animal was slightly smaller 

 than the panther, and about as large as the smaller contemporaneous 

 Drepanodons, whose formidable upper canines it also possessed. Its 

 remains were first found by Hayden in the Bad Lands of Dakota,, 

 but molars of the same I subsequently obtained from the White 

 River, in Nebraska. Cope has obtained additional genera, allied 

 to the above, from Colorado. He has also described from the Mio- 

 cene of Colorado several species of the dog family (CanidcB), mostly, 

 however, of small size. I have found a few of their teeth in the 

 Miocene of Nebraska, but from the paucity of the materials, I was 

 unable to identify them specifically. 



If, as Cope supposes, the Leptochoerus of the Bad Lands was 

 most closely allied to the quadrumanna, then the monkeys were 

 here during the Miocene epoch. He has also described several 

 species from the Colorado Miocene. One of these he has named 

 Menotherium lemurinum, because of its close relationship to the 

 modern lemurs. It was about the size of the common cat. I infer 

 their presence in the Nebraska Miocene from the discovery on the 

 Whits Earth of a molar referable to this species. No doubt, there- 

 fore, that during these times the monkey family was present and 

 chattered in the woodlands of eastern Nebraska during Miocene 

 times. 



Many additional species of mammals have been unearthed in the 

 Miocene of Colorado which have not yet been found in the plains, 

 but which no doubt flourished here at that time. The preceding 

 animal forms, however, are only a small part of the species that 

 have been found, and all of those found probably are only a small 

 part of those that flourished during Miocene times. During the 

 whole of this epoch, which, as has already been stated, evidently 

 was of long duration, there was a most happy combination of phy- 

 sical geography and climate. Warm, temperate conditions existed 

 almost to the poles. In Nebraska the magnificent savannas and 



