of the Genus Stenomylus. 



319 



molars, lower canine completely caniniform, diastema between 

 lower premolar 1 and 2 relatively long, premolar 2 greatly 

 reduced, lower jaw deep, metacarpals separate their entire 

 length. In general the species is the least specialized of the 

 three. 



Stenomylus crassipes sp. nov. 



The species is distinguished in that while the size of the 

 skull is approximately that of S. gracilis, the neck and limbs 

 are markedly shorter and heavier ; the premolars are much 

 more reduced; and the lower canine is completely incisiform. 



To this the following details may be added as a description 

 of the species. The type is number 2150 in the Amherst 

 College collection, and was found seven miles northeast of 



Fig. 27. 



Fig. 27. Stenomylus crassipes, upper dentition and palate, x 1/2. 



Agate, Sioux Co., Neb., in the uppermost sandstones of the 

 Lower Harrison beds. The type consists of the skull (lacking 

 premaxillse) and lower jaws, together with 6 cervical, and 3 

 dorsal vertebrae, scapula, humerus, ulno-radius, carpals, meta- 

 carpals, and phalanges. With this has been used specimen 

 14220 of the American Museum of Natural History, consisting 



Fig. 28. 



Fig. 28. Stenomylus crassipes, mandible 

 outer side, x 1/2. 



and lower dentition for the 



