518 THE WASATCH EPOCH. 



The two internal cusps are unique in the family The additional one is a 

 growth of the inner extremity of the posterior cingulum, and is separated 

 from the anterior inner cusp by a deep and wide notch. It is opposite to 

 the posterior V, as the anterior inner cusp is opposite the anterior rudi- 

 mental V. The premolar and incisor teeth are similar to those of Corypho- 

 don. The skeleton is unknown. 



Manteodon subqdadratus Cope. 



Loci supra citati. 

 Plate XLIVo; figs. 1-5. 



The characters of this pantodont are learned from a series of teeth 

 which were found together by Mr. Wortman free from admixture of others. 

 They are not worn, excepting by moderate use by the animal when living. 



The last superior molar is not of the oval form belonging to the species 

 of Corypliodofi^ but is quadrate, with the internal side shorter, and with 

 rounded lateral angles. The first anterior cingulum, which represents the 

 anterior basal cingulum of the Lophiodontidce, is as elevated as in the species 

 of Coryphodon. Externally it rises in a protuberance with sharp edge, which 

 curves posteriorly and disappears on the external side of the crown. The 

 inner extremity terminates abruptly, forming the anterior interior tubercle. 

 The anterior external lobe is rather flat, and is not conical nor elevated 

 above the anterior cingular lobe. It is not deeply separated from the latter, 

 nor from the posterior V ; its edge is rough. The posterior V projects well 

 inwards, and is rather narrow. Its posterior border extends as far out- 

 wards as the point of junction of its anterior border with the anterior 

 external lobe, and terminates in a slight elevation of its border. The base 

 of the crown extends external to the base of the V, and forms a strong 

 posterior external protuberance. This causes the outline of the external 

 base to be concave. This side of the crown has several small protuber- 

 ances and rugosities. The posterior basal cingulum extends as far exter- 

 nally as the posterior V, and -terminates internally in tlie posterior internal 

 cusp. The second or basal anterior cingulum is well developed. There are 



