202 Wortman — Studies of Eocene Mammalia in the 



A well-preserved anterior portion of a skull of jPalwonictis 

 americamis was secured by the writer in the Wasatch horizon 

 of the Bio; Horn Basin, in 1891, which formed the basis of the 

 description of this species and is the best specimen of the 

 group thus far recovered. Amblyctonus is known from a few 

 fragmentary remains of teeth and jaws only. ~No other skele- 

 tal parts have been found. 



JElurotherium latidens Marsh. 



Limnofelis latidens Marsh, this Journal, vol. iv, August, 1872; Patrlofelis leidy- 

 anus Osborn and Wortman, Bull. Amer. Mus., vol. iv, no. 1, 1892; Patriofelis 

 leidyanus Wortman, Bull. Amer. Mus., 1894, p. 164; JE lur other ium leidyanum 

 Adams, this Journal, June, 1896, p. 442. 



Professor Marsh, in describing Limnofelis latidens, states : 

 "A second very large Carnivore, but inferior to the preceding 



40 



Figure 40.— Left lower jaw, with milk teeth and first permanent molar, of 

 jEluroiherium latidens Marsh; inside view; three halves natural size. (Type.) 



in size, is indicated by a last upper premolar and probably by 



some other fragmentary remains Another specimen 



apparently of this species is a left lower jaw of a young indi- 

 vidual. It contains the canine and three (four) molars, the last 

 of which is still nearly enclosed in the jaw." It is now evi- 

 dent that the fourth premolar above mentioned belongs to 

 Patriofelis ferox, which was previously described by Pro- 

 fessor Marsh ; and that the second specimen, or that of the 

 immature individual, figures 40, 41, is a member, not only of 



