PKOSIMUB, 241 



covery of the superior series. For instance, the formula may be: I. 1; C. 

 . 1 ; Pm. 3. 



The supposed incisor is a large tooth, issuing from the ramus at the 

 symphysis like a rodent incisor, and has an oval section, with long diameter 

 parallel to the symphysis. The crown is lost from all the specimens. The 

 second tooth is similar in form to the first, but is much smaller. It is situated 

 posterior and external to the first. The next tooth is still smaller, and is one- 

 rooted. The third and fourth premolars have simple conic crowns, and more 

 or less developed heels without cusps. The true molars are in general like 

 those of Felycodus ; i. e., with an anterior smaller, and a posterior, triangle or V. 

 The supplementary anterior inner cusp is quite small, while the principal 

 anterior inner is elevated. The posterior inner is much more elevated than 

 in the species of Pelycodtis. Last inferior molar with a fifth lobe. 



This genus cannot be referred to its place without additional material, 

 but the parts discovered indicate it to be between Felycodus and Cynodoh- 

 tomys, either in the Mesodonta or the Prosimice. I may here remark that 

 in defining the latter genus I was in doubt as to the number of the inferior 

 premolars. The discovery of the present genus renders it probable that it 

 has three such teeth, and that the anterior two are each one-rooted. 



MiXODECTES PUNGENS Cope. 



Proceed. Ainer. Philos. Soc, 1883, p. 447. 

 Plate XXIVf ; fig. 1. 



The mandible of the Mixodectes pungens is about the size of that of the 

 mink. Its inferior outline is sti-aight to below the second premolar, whence 

 it rises upwards and forwai'ds like that of a rodent. The anterior masse- 

 teric ridge is very prominent, but terminates below the middle of the ramus 

 Inferior masseteric ridge much less pronounced. The inferior part of the 

 ramus is robust below the base of the coronoid process, but there is no in- 

 dication of recurvature of the edge. Mental foramina two ; one below the 

 front of the first true molar, and one below the second premolar. 



The oval base of the canine is not flattened on either side; that of the 

 second tooth is flattened on the inner side. There is a great difference be- 

 tween the sizes of the last three premolars. The fourth is twice as large 

 16 c 



