204 P. N. Bose—History of the Extinct Carnivora. 
Cynodictis.1 Elocyon, Cyotherium, and Cynodictis have been affiliated 
by some paleontologists with Cynodon, thus bringing back the date 
of the appearance of this genus to the Upper Hocene. Pictet has 
referred some fossils from the “Siderolithiques” of Mauremont to 
the Amphicyon of Lartet (a characteristically Miocene genus), and the 
Cynodon of Aymard.*? The age of these beds is somewhat uncertain. 
But they are generally correlated with the Barton clays of this 
country, and the “Gres de Beauchamp ” of France. The appearance 
of Amphicyon and Cynodon would, in that case, be coeval with the 
deposition of the lowest beds of the Upper Hocene or the Oligocene 
of some geologists. Though supposed by Prof. Gaudry to retain 
traces of their Marsupial ancestry, the location of both these genera 
in the order of the Placental Carnivora has never been questioned. 
Some superb specimens are described by M. H. Filhol in his elabo- 
rate work* on the paleontology of the Phosphatic beds of Querey 
under the title of “Cynohycenodon,” but they are not generically dis- 
tinct from Proviverra (Riitimeyer) of certain Swiss “Siderolithique ” 
deposits which have been placed by some geologists on the same 
horizon as the Bracklesham Series. They have too strong a resem- 
blance, however, in their dentition to Hygnodon and Pterodon to be 
dissociated from these, and have accordingly been located with them 
amongst the Didelphide by Prof. Gaudry. 
The only other Eocene genera of the Old World which have ever 
been referred to the Carnivora are the Tylodon and Galethylaz of 
Gervais.‘ They are both very imperfectly known. 
Within the last eight or nine years a flood of light has been thrown 
on the history of the Carnivora by the remarkable discoveries in 
America. In 1870, Dr. Leidy described a peculiar Carnivore from 
the Bridger Eocene under the designation of Patriofelis.2 Two years 
later he described two other forms, Sinopa and Uintacyon, the former 
supposed by Dr. Leidy to be intermediate between Canis and 
Hyenodon, and the latter “a carnivorous animal probably marsupial.” 
These three genera, comprising five species, have been re-described 
with plates in the Report of the United States Geological Survey of 
the Territories. But the specimens on which they are based are 
very imperfect. Prof. Cope was more fortunate with his Iesonyz 
and Synoplotherium, both from the Eocene of Wyoming, and both 
presenting some points of resemblance to Hyenodon.’ Hardly three 
years had expired since these two most remarkable forms of Carni- 
vorous animal were brought to the notice of the scientific world, 
when Prof. Cope described several highly interesting Carnivores 
from the Lower Eocene (Wahsatch formation) of New Mexico.’ He | 
* “ Notice sur les Ossem. foss. de la Debruge,”’ p. 5. 
* “Memoire sur les Animaux Vertébrés trouvés dans le Terrain Sidérolithique du 
Canton de Vaud,” pp, 73, 75, Pal. Suisse, 5¢ sér. pp. 134, 137. 
° “ Recherches sur les Phosphorites du Quercy,” Paris, 1877. 
* “Zool. et Pal. Francaise,” 2° ed. pp. 219 and 225. 
> Proc. Ac. of Sc. Philad. 1870, p. 10. 
® op. eit. vol. i. pp. 114-118; pls. ii. vi. and xxvii. 
7 Proc. Amer. Philos. Soc. for 1872, pp. 460, 483; Ann. Rep. of the U.S. G. 8. 
of the Terrs. for 1872, pp. 550, 554. 
® Suppl. Cat. of the Vert. of the Eocene of N. Mexico collected in 1874. 
