Douglass : Vertebrate Fossils from Fort Union Beds. 23 



mediate between that of the third and fourth upper premolars of 

 Euprotogoiua puercensis Cope. The inner cusp is small, low, and con- 

 ical. A cingulum nearly surrounds the tooth and the enamel is con- 

 siderably wrinkled. 



mm. 



Length of tooth, antero-posterior 7-5 



Width of tooth 7.2 



No. 1 164 (PI. II, Fig. 12) is the crown of an almost unworn lower 

 molar. The crown is low. There are two large anterior conules and 

 a transverse ridge or ledge anterior to them. On the talon or posterior 

 portion of the tooth there are three cusps, the external and internal of 

 which are large and the median small. A low ridge passes from the 

 antero-internal to the postero-external cusps. 



mm. 



Length of molar, antero-posterior 1 1 . 5 



Width of molar 9.5 



No. 1932 (PI. II, Fig. 13) consists of one complete crown of a 

 lower molar and the posterior portion of a second, which may belong 

 to different species. They are much smaller than 1164. 



Length of complete molar. 



Family MIOCL^NID^ Osborn and Earle. 

 Mioclaenus Cope. 



(Proc. Amer. Philos. Soc, XIX, Sept. 17, 1S81, pp. 487 and 489.) 



(No. 1680, Carnegie Museum Catalogue of Vertebrate Fossils.) 

 The specimen consists of a first lower molar in a portion of a 

 mandible. The antero-internal and antero-external cusps are united 

 to near their tops. From the anterior portion of the antero-external 

 crescent, a ridge extends inward across the anterior portion of the 

 tooth uniting with the anterior portion of the antero-internal cusp, 

 but there is no distinct anterior conule. The postero-external is a 

 little larger than the antero-external cusp, but is not quite so high. 

 Internal to the postero-external cusp is a depression which is bounded 

 internally and posteriorly by a crescent-shaped cingular cusp. This 

 cusp is divided by a groove above and internally, making it appear 

 like a flattened double cusp. 



mm. 

 Length of molar 5 



