520 THE WASATCH EPOCH. 



and indicating the outlines of a V which lacks its posterior side, in a man- 

 ner not seen in Coryphodon. The penultimate and ante-penultimate supe- 

 rior molars are like those of the latter genus. Skeleton unknown. I have 

 a single species of this genus. 



ECTACODON CINCTUS Cope. 



Paleontological Bulletin, No. 34, p. 1G7, Feb. 20, 1882. Proceed. Amer. Philo. Soc, 1881, Dec., pi. 167 (1882). 



PlateXLIVa; fig. 6. 



Six superior molars of one skull represent this species. They belong 

 to a large animal, one about the size of the Manteodon suhquadratus. The 

 last superior molar has a characteristic outline. It is not oval as in the 

 species of Corypliodon, nor quadrate as in Manteodon sp., but sub-parallelo- 

 grammic. The transverse diameter exceeds the anteroposterior, and the 

 anterior and posterior sides are pai-allel. The external outline is slightly 

 oblique and slightly notched in the middle. The internal border is regu- 

 larly rounded. The basal or second cingulum extends entirely round the 

 tooth from the posterior external cusp, round the inner base to the anterior 

 external base of the crown, being absent only from the external base. 

 The first cingula, both anterior and posterior, are well developed, as in the 

 species of Coryphodon, and unite in the prominent internal angle. The 

 posterior first cingulum joins the posterior basal cingulum at the middle of 

 its length. The anterior first cingulum extends to the anterior external 

 part of the crown, and then turns downwards and posteriorly, and termi- 

 nates at the middle of the external base. The posterior crest is not trans- 

 verse, but quite oblique, sloping at an angle of 45° with the axis of the jaw. 

 The part of the crest which represents the posterior V is a good deal larger 

 than the part representing the anterior V, and is closely joined with it. 

 The latter is well separated from the anterior first cingular ridge and its 

 anterior exterior elevated portion. The enamel of this tooth is finely 

 wrinkled, and is more readily worn smooth than in the Manteodon suh- 

 quadratus. 



The penultimate superior molar has the posterior V well developed, 

 and its posterior basal or external angle is marked by a tubercle homol- 

 ogous with that which is so prominent on the last molar. The anterior V 



