Cope.] J-bfr [Dec. 16, 



The type of Manieodon is the M. subquadratus, which was about the size 

 of an ox. The characters of its superior molars are more like those of 

 Perissodactyles than are those of the other Coryphodontidm. The type of 

 Ectacodon is the E. ductus, a species of about the dimensions of the last 

 named. Its last superior molar is parallelogrammic, and has a cingulum 

 all around it except on the external side. 



Makteodon subquadratus, gen. et sp. nov. 



Char. gen. These have been already pointed out in the key above given. 

 They are a little more like those of the superior molar teeth of such 

 Perissodccctyla as Limnohyus and near allies, than those seen in the typical 

 Coryphodon. The posterior transverse crest of that genus is here rep- 

 resented by a complete V, but the anterior lobe of that crest which repre- 

 sents the anterior V of the Perissodactyle, is only a lobe, as in Coryphodon. 

 The tooth in fact is much like the penultimate molar of the latter genus. 

 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 Coryphodon. 

 The skeleton is unknown. 



Char, specif. These 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 of the animal when living. 



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

 of Coryphodon, 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 Lophiodontidm, is as elevated as in the 

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

 edge, which curves posteiiorly 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 ex- 

 tends as far outwards 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 

 protuberances and rugosities. The posterior basal cingulum extends as 

 far externally as the posteriory, and terminates internally in the posterior 

 internal cusp. The second or basal anterior cingulum is well developed. 

 There are no external nor internal cingula. The surface of the enamel is 

 strongly and closely rugose where not worn. 



The posterior inferior molar exhibits a transverse posterior crest, without 



