CONDYLARTHEA. 427 



M. 



Diameters Of inferior M.n^''°t«^«P''«*«"'"^ O"'^ 



( transverse 0080 



Depth of ramus at M. ii 0*^40 



Thickness of ramus atM. ii 0110 



From the Puerco beds of Northwestern New Mexico. Discovered 

 by Dr. Baldwin. 



ANACODON Cope. 



Paleontological Bulletin, No. 34, p. 181, Feb. 20, 1882. Proceed. Amer. Philos. Soc, 1881, p. 181. 



Char. gen. Known only from mandibles supporting molar teeth. 

 Probably family Phenacodontidoe. Last inferior molar with heel. Crowns 

 of molars without distinct cusps, but with a superior surface consisting of 

 two low transverse ridges separated by a shallow valley. Unworn grind- 

 ing surface with shallow wrinkles. Perhaps only three premolars. 



The only species known is from the Wasatch epoch. 



Anacodon ursidens Cope. 



Loc. sup. cit., p. 183. 

 Plate XXVe; fig. 11. 



Broken mandibular rami of two individuals constitute the basis of my 

 knowledge of this species. It is of the size of the Phenacodus primcevus. 

 The last inferior molar is wedge-shaped with the very obtuse apex posterior. 

 It displays two slight transverse elevations anteriorly, winch represent the 

 usual cusps. Grinding surface generally nearly flat. The posterior half of 

 the crown of the penultimate molar is flat, and is separated from the ante- 

 rior half by a transverse groove. Its surface is marked by shallow branch- 

 ing grooves. 



The molar preceding this one in the broken specimen is probably the 

 first. It is possible from its slightly worn condition that it is the fourth 

 premolar, but the form is that of a true molar. The surface of the crown 

 is marked by shallow grooves not very closely placed. The three premolar 

 teeth in advance of this tooth are broken oif. Their bases are narrow. 



There are no basal cingula on the molars. 



