894 THE WHITE RIVER FAUNA. 



AMPHICYON Lartet. 



Bulletin Soci6t€ G^ologique de la France, 1836, vii, 217-220; Blainville, Comptes-Rendus, 1837, v, 434; 

 L'Institut, 1837, v, 18-19; Blainville, Osteographie, ix, Subursus, 78-96. 



3 1 4 3 



Dental formula: I. ^^ : G. ^-j Pm. -; M. -. The true molars of the 

 o 1 4 o 



superior series all tubercular; the last two of the inferior series also tuber- 

 cular. First inferior true molar a sectorial, with an internal tubercle and a 

 heel with a superior groove, bounded by raised borders. Humerus with an 

 epi trochlear arterial foramen. 



Much is yet to be desired in the elucidation of the characters of this 

 genus, especially of the American forms, which are less abundant and of 

 smaller size than those of Europe. The typical species, Amphicyon major 

 Blv., was the largest, equaling a bear in size. It is derived from the Mio- 

 cene of Sansan, and a smaller form of it is found, according to Pomel, at 

 San Gerand-le-Puy. Other species are derived from the latter locality, and 

 all are typical of the Miocene formation in Europe. In the "Mio-pliocene" 

 of India a single species has been discovered, the A. palceindicus of Lydek- 

 ker. Three species occur in the Lower and Middle Miocene of North 

 America, the largest of which about equals the wolf in size. On account 

 of the large development of the inferior tubercular teeth, I have suspected 

 that the Canis ursinus Cope, from the Loup Fork group of New Mexico, 

 would prove to be an Amphicyon. If so, it is the only representative of this 

 genus in our Upper Miocene. 



The three American species differ as follows: The A. cuspigerus is small, 

 not exceeding the kit-fox in dimensions. The A. hartshornianus is about 

 the size of a coyote, and has rather smaller tubercular molars, especially of 

 the lower series. The A. vetus is a little larger, but has the tubercular mo- 

 lars disproportionately larger than those of the A. hartshornianus. 



Amphicyon vetus Leidy. 



Daphwnus vetm Leidy, Proceed. Academy Philada., 1853, 393. Amphicyon vetus Leidy, 1. c, 1854, 157, 

 1857, 90. Extinct Mammalia Nebraska, Dakota, 1869, p. Z'ipartivi. Plate I, figs. 1, 2, and 5. 



Dr. Leidy's descriptions last cited above, with the accompanying fig- 

 ures, cover two species, a larger and a smaller, the latter being the A. harts- 

 hornianus. Of the true A. vetus my collection includes a fragmentary skull 



