264 



THE WASATCH AND BRIDGEK FAUN^. 



forms of the Felidce, which are nearest, are the Cryptoprocta, and the Proce- 

 lurus of Filhol, but they only follow after a wide interval. I have else- 

 where discussed the successive steps in the evolution of the sectorial itself* 

 I have also pointed out f the successive shortening of the anterior part of 

 the dental series in the Felidce and other groups of existing Carnivora, 

 which came later in time. 



The following table will give an idea of these affinities, and the 

 phylogeny to be derived from them : 



Felidw. 



Felidae. 



Oxycena. 



Oxvsenidse. 



CaDidse. 



Canidae. 



Miacidse. 



Hyaenodontidae. 



LeptictidiE. 



Meson vchidae. 



Amblvctoiiidse. 



Synonynn/. Professor Gaudry has united Stypohphus {Cynohyoenodon 

 Filhol) with Proviverra. After an examination of casts of Riitimeyer's 

 types preserved in the Museum of the Jardin des Plantes, I retain them as 

 distinct for the reasons given above. Mr. Bose, in an interesting paper <in 

 this sul)ject, published in the London Geological Magazine for May and 

 June, 1880, unites Didymictia with Palceonyctis. Having examined the tyjjcs 

 of both genera, my conclusion, as expressed in the preceding pages, is a dif- 

 ferent one. On the other hand, I have good reason for believing the species 

 to which the name Synoplotherium was given, S. lanius, is really a sec(»nd 

 species of Mesonyx, of larger size than the M. ohtmidevs, and otherwise 



* ProceediDgs Acad. Phila., 1875, |i. 21. t Folidie and Canidie, loo. cit., 1879, ji. 169-170. On 



the Extinct Cats of Amecica, American Naturaliitt, December, 18d0. 



