SUPPLEMENT. 305) 



develops an anterior basal cusp. The cranium (fig. 46) is elongated ; 

 and the talon of the lower true molars comparatively small. 



Gaudry (' Les Enchainements, etc. Mamm. Tert.' p. 20) identifies 

 Cynohycenodon with Proviverra ; while Cope (Amer. Nat. vol. xviii. 

 p. 351), who retains the latter, regards the former as a synonym of 

 Stypolophus. 



Proviverra cayluxi (Filhol J ). 



Syn. Cynohycenodon cayluxi, Filhol 2 . 

 Stypolophus cayluxi, Cope 3 . 



Hob. Europe (France). 



M. 2384. The greater part of the right ramus of the mandihle ; 

 from the Quercy Phosphorites. Similar to the specimen 

 figured by Gaudry, op. cit. fig. 14. Purchased, 1885. 



Genus DELTATHERIUM, Cope 4 . 

 Syn. Lipodectes^QTpQ 5 . 



Dentition : I. ?, C. j, Pm. jj, M. |. The upper true molars are 

 wider internally, more equal in size, and differ less from pm. 3 and 

 pm. 4 than in Proviverra ; the cranium is shorter, and the talon of 

 the lower true molars larger. 



Deltatherium fundaminis, Cope e . 



Syn. Lipodectes penetrans, Cope 7 . 



This is the type species. 

 Hob. North America. 



M. 2571. Fragment of the right maxilla, showing portions of three 

 hinder cheek-teeth ; from the Puerco Eocene of New 

 Mexico. This and the next specimen agree precisely 

 with the corresponding portions of the skull figured by 

 Cope in the ' Amer. Nat.' vol. xviii. p. 352, fig. 20. 



Presented by R. Lydekker, Esq., 1885. 



M. 2571 a. Part of the left ramus of the mandible, showing m. 2 ; 

 from New Mexico. Presented by E. Lydekker, Esq., 1885. 



Bull. Soc. Philom. Paris, s6r. 6, vol. x. p. 87 (1873) Cynohyamodon. 



Loc. cit. 



Amer. Nat. vol. xviii. p. 351 (1884 J. 



Ibid. vol. xv. p. 337 (1881). 



Ibid. vol. xv. p. 1019 (1881). 



Ibid. vol. xv. p. 337 (1881). 



Ibid. vol. xv. p. 1019 (1881). 



