414 NOTES ON THE CANIDH OF THE WHITE RIVER OLIGOCENE. 
63. The known American species of the genus are: C. gregarius Cope and C. 
lippincottianus Cope (the latter doubtful) from the White River, and C. gregarius Cope, 
C. geismarianus Cope, C. latidens Cope and C. lemur Cope, from the John Day. 
64. The dogs are represented in the Uinta by two lines, ? Cynodictis and Miacis, the 
former continued through the White River and John Day and the latter apparently 
passing into Daphenus of the White River, and through this into Temnocyon, Hypo- 
temnodon, Cynodesmus and Enhydrocyon of the John Day, Oligobunis of this formation 
being probably an immigrant from the Old World. 
65. M. Boule’s hypothesis that the alopecoids are derived from Cynodictis and the 
thooids from Amphicyon implies an improbable degree of convergent development, but 
it is not to be rejected as impossible. According to present evidence the alopecoids 
arose relatively late from the thooid stem. 
66. The thooid line appears to be Miacis—Daphenus— Cynodesmus—Canis, the re- 
tractile claws of Daphenus having been changed when the digitigrade gait and cursorial 
habit were assumed. 
67. The very many resemblances between Daphenus, Cynodictis and Dinictis were 
probably not independently acquired, but point to a common Eocene ancestor. 
68. The early members of the canines, felines, mustelines and yiverrines all have a 
great many more structural features in common than do their existing representatives 
and would seem to converge to a single Eocene type, which may prove to be the 
creodont family Miacide. The hyznas and bears belong to a later cycle of develop- 
ment and were derived, the former from the viverrines and the latter from the dogs. 
LITERATURE. 
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Bruce, A. T. ’83. Observations upon the Brain Casts of Tertiary Mammals. Ball. Princeton Geol. Museum, No. 3. 
Corr, E. D. 84. Tertiary Vertebrata, Washington, 1884. 
EYERMAN, J. ’96. TheGenus Temnocyon, etc. American Geologist, Vol. XVII. 
Frower, W. H. ’69. On the Value of the Characters of the Base of the Cranium in the Clas-ification of the Order 
Carnivora, etc. Proc. Zod]. Soe., London, 1869. 
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