ARTIODACTYLA. 



GENERA INCERT^ SEDIS. 

 ITHYGRAMMODON, gen. jiov. 



Our fragments of this fossil show an animal about the size 

 of the llama, and approximating more closely to the Tylopoda 

 than to any living forms. 



The genus is established upon the two premaxillary bones, 

 containing the incisors, parts of the maxillaries, the canine 

 and the first premolar ; besides fragmentary portions of the 



palatine plates. As the peculiar features of these remains 

 render them unique, we are warranted in establishing the 

 genus ItJiygraiiunodoii. 



Generic characteristics. 



The premaxillaries are long, narrow, and very straight, 

 bent slightly in on their own axis as in Camclidce, but ex- 

 panded laterally at the end of symphysis as in Pecora. The 

 upward processes are sharply defined, with a wide, rounded 

 upper border. 



The upper incisors are six in number, and are placed nearly 

 in a straight line fore and aft, separated from each other and 

 from the canine by small and subequal diastemas. 



The incisors are nearly equal in size, cylindrical in shape, 

 are placed vertically in their alveoli, and are slightly re- 

 curved. 



The spine .of the premaxillaries is long and thin, giving 

 very long anterior palatine foramina, as in Rnminantia. The 



