GEOLOGICAL SURVEY OP THE TERRITORIES. 343 



preceding species, this one was no doubt equally destructive to the 

 smaller herbivorous animals. 



Hycenodon cruentus. — A species thus named, intermediate in size to 

 the two foregoing, is indicated by several fragments of jaws and teeth 

 found in association with the remains of the former. 



FELID^E. 



The feline animals forming the family with the above name were 

 well represented among the carnivores of both the middle and later 

 tertiary periods of Dakota and Nebraska. 



PSEUD JELTJRUS. 



This genus, differing from that of felis or the true cats only in the 

 possession of an additional small tooth to the molar series of the lower 

 jaw, was originally named from remains found in the middle tertiary 

 formation of France. 



Pseudcelurus intrepidus. — This species is indicated by a well-preserved 

 lower jaw, discovered by Professor Hay den in the pliocene sands of 

 the Mobrara Valley of Nebraska. It was intermediate in size to the 

 panther (Felis concolor) and the lynx, (Felis canadensis,) and in ana- 

 tomical character and habits was no doubt very similar. 



DREPANODON. 



This remarkable feline genus, fortunately for animals of a more peace- 

 ful nature, now utterly extinct, during the tertiary period appears to 

 have had a wide range of distribution throughout the earth. Its re- 

 mains have been discovered in the middle and later tertiary formations 

 of Western Europe, Greece^ the sub-Himalayan Mountains of Asia, and 

 of both Americas. Several of the larger species equaled in size the 

 lion and tiger, and, judging from their formidable array of destructive 

 weapons, were of even greater ferocity. In comparison with the exist- 

 ing feline animals they are especially marked by the greater propor- 

 tionate' size and compressed form of the upper canine teeth, which have 

 given to the animals the name of saber-toothed tigers. 



Two* species of the genus appear to have inhabited Dakota during 

 the formation of the mauvaises terres deposits of White Eiver. 



Drepanodon primcevus. — A species not quite so large as the living 

 panther is indicated by a number of skulls, jaw fragments with teeth, 

 and other bones, first collected by the late Drs. Evans and Shumard, and 

 subsequently by Professor Hayden and Mr. Meek. Two of the skulls 

 that have been found exhibit the marks of conflict with some equally 

 rapacious animal, most probably the largest Hycenodon, as the depres- 

 sions made by the teeth On opposite sides of the specimens exactly cor- 

 respond with the prints of the canines of the latter. 



Hrepanodon occidentalis. — The second species, indicated by several jaw 

 fragments, discovered by Dr. Hayden, was about the size of the exist- 

 ing panther. 



DINICTIS. 



This name has been appropriated to an extinct genus of feline ani- 

 mals, represented by remains, thus far only discovered in the mauvaises 

 terres miocene deposits of White Eiver, Dakota. It is nearly allied- to 

 the preceding genus, but differs from it in the possession of two addi- 

 tional teeth to the molar series of the lower jaw. 



Dinictis felina. — A unique species, indicated by two nearly complete 



