1 30 Bulletin American Museum of Natural History. [Vol. XVI, 



jaws are complete although crushed, and the first eight ver- 

 tebrae are in place. The succeeding nine vertebrse and parts 

 of the hind limb were found close by. All were enveloped 

 in hard flinty concretion, which has been removed from one 

 side only of the specimen. The horizon is the Loup Fork 

 terrane, which, in the part of Texas in which this specimen was 

 found, contains a fauna approximately Upper Miocene in age 

 so far as comparisons have been instituted. 



It is only within the past two years that true Amphicyons 

 have been recognized in this country, the species referred to 

 that genus by Leidy and Cope being, as Prof. Scott has 

 shown,' much more primitive, and nearly or quite in the line 

 of descent of the modern Canidas, while the true Amphicyons 

 are an aberrant branch of dogs, related to the Ursidae, but 

 not directly ancestral to them, according to Dr. Schlosser's 

 recent studies on the group. ^ In the 'American Journal of 

 Science' for January, 1901, however, Dr. Wortman has de- 

 scribed a true Aniphicyon from the Loup Fork beds of Ne- 

 braska. Mr. Earl Douglas has recognized the genus in the 

 same terrane in Montana. The American Museum Expedi- 

 tions of 1 90 1 obtained remains of Amphicyons both in the 

 older Loup Fork of Colorado (Middle Miocene) and the newer 

 Loup Fork of Texas (Upper Miocene). To this group may 

 also be referred three species of Canidae described some time 

 since, but whose position has not been recognized. These 

 are: 



Cams {jElurodon) iir sinus Cope,' from the Loup Fork of 

 New Mexico. 



Borophagus diver sidcns Cope," from the Blanco of Texas. 



Mlurodon mcBandrinus Hatcher,' from the Loup Fork of 

 Kansas. 



The specimen here described represents a species distinct 

 from any of those above mentioned, and is named in honor 



» Notes on the Canidae of the White River Oligocene, Trans. Amer. Phil. Soc, Vol. 

 XIX, 1S98, p. ,^26 et scq. 



' Ueber die Baren und barenahnlichen Forinen des europaischen Tertiars. Palaeon- 

 tographica, Bd. XLVI, iSgg, p. 95 et seq. 



3 Proc. Acad. Nat. Sci. Phila., 1875, p. 256; Rep. Wheeler Survev, 1.S77, p. 304, pi. 

 Ixix, fig. I. 



< American Naturalist, 1802, p. 1028; Rep. Tex. Geol. Sur., 1892, p. 52, pi. xiii, fig. 4. 



^ American Naturalist, 1894, p. 239 and fig. 



