82 ON THE EXTINCT MAMMALIA OF 



genus, there appear to be represented, as the formula of the tubercular molars, three 

 for the upper jaw and two for the lower one. Prof. Bronn* gives as the formula for 

 the molar dentition of Amphlcyon, for the upper scries : 3 premolars, 1 sectorial 

 molar, and 3 tubercular molars ; for the lower series : 4 premolars, 1 sectorial molar, 

 and 2 tubercular molars. Pictetf gives the same formula for the upper molar series, 

 but for the lower series 4 premolars, 1 sectorial molar and 8 tubercular molars. 



Fossil remains from the miocene deposits of France and Germany have been 

 referred to a dozen different species of Ampliicyon, though but a small proportion, 

 from a paucity of material, have been well characterized. Several teeth, apparently 

 of a huge species of the genus, were indicated by CuvierJ as having belonged to a 

 " Chien d'une taille gigantesque." 



The best characterized species of the genus, also of huge size, and thought by De 

 Blainville and M, Gei'vais to be the same as the "Chien" just mentioned, is founded 

 on the specimens obtained at Sansans by M. Lartet, and named by De Blainville 

 Amphlcyon major. 



The remains of two species of carnivorous animals, apparently referrable to the 

 genus Amphicyon, have been found in association with remains of Oreodon, etc., in 

 the calcareous marl deposit of the Mauvaises Terres of White Eiver, Dakota. 



Amphicyon vetus. 



Viewing the fossil remains from Sansans, France, as typical of the genus Amphi- 

 cyon, indicated by M. Lartet, and specified under the name of J., majoi- by M. De 

 Blainville, the remains of a smaller species, apparently referrable to the same genus, 

 were discovered by Dr. John Evans and Dr. Hayden in the Mauvaises Terres of 

 White River, Dakota. They consist of a mutilated cranium, without the face, 

 together with fragments of the jaws from the same individual, and small fragments 

 of jaws, apparently of three other individuals. 



The fossils indicate a skull approaching in size that of the Prairie Wolf, Cams 

 latraiis, but having a smaller cranium, more powerful jaws, and smaller and more 

 numerous teeth. 



The specimen of the cranium has lost the greater portion of the occipital region, 

 one zygoma, and is otherwise mutilated and fissured. It belonged to an old animal, 

 nearly all the sutures being so completely obliterated as not to be traceable in their 

 course. 



The cranium, as seen in the upper view, figure 1, plate I, is altogether smaller 

 than in the Prairie Wolf, and does not much exceed that of the Red Fox, Canis 

 fulvus. Proportionately to its size, it is longer, narrower, and of less depth and full- 



* Lethaaa geognostica, 3 ed., p. 1080. f Traite de Paleoatologie, t. 1, p. 194. X Ossemeus Fossiles. 



