PANTODONTA. 517 



modon, Edacodon, Manteodon, cand Metalojjhodon. The last is easily distin- 

 guished from the first by its dental characters, but Bathmodon rests on a pe- 

 culiar foot structure, and its dental characters are unknown. As the feet 

 of Metalophodon are not known, it is possible that it is identical with Bath- 

 modon. Several species also have been referred to Coryphodon, of which the 

 foot structure has not been ascertained, so that it is possible that some of 

 them are Bathmodontes. The solution of these questions will depend on 

 future discoveries ; meanwhile I leave most of the species in Coryphodon. 

 In determining the last-named genus I have had the advantage of access 

 to the specimens contained in the Museums of London and Paris, a privi- 

 lege which I owe to Professors Owen, Gervais, and Hubert. To the last- 

 named gentleman I am under especial obligations, as the specimens of Cory- 

 phodon eoccenus contained in the Museum of the Sorbonne are much the 

 most perfect in Europe. 



I give the characters of the genera below : 



I. Last superior molar with two interior cusps. 



All the superior molars with a well-marked external posterior V Manteodon. 



II. Last superior molar with but one inner cusp or angle. 



a. Last superior molar with posterior external cusp. 

 Anterior two molars with posterior external V Ectacodon, 



aa. Last superior molar without external jjosterior cusp, 

 t Anterior two molars with posterior external V. 



Astragalus transverse, with internal hook Coryphodon. 



Astragalus subquadrate, without internal hook Bathmodon, 



ft First superior molar only, with posterior external V Metalophodon. 



MANTEODON Cope. 



Proceed. Amer. Pbiloso. Soc. 1881, Feb., 1882, p. 166. American Naturalist, 1882, p. 73 (Dec. 30, 1881). 



The generic characters have been already pointed out in the key above 

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

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

 Cpiyphodon. The posterior transverse crest of that genus is here repre- 

 sented 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 Gorypliodon. 

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



