SUPPLEMENT. . 309 



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 

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

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

 Sti/poIo2?hits. 



Proviverra cayluxi (Filhol ^). 



Syn. CynohycBnodon cayluxi, Filhol ^. 

 Stypolophiis cayluxi, Cope ^. 



Hob, Europe (France). 



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

 from the Quercy Phosphorites. Similar to the specimen 

 figured by Gfaudry, op, cit. tig, 14. Purchased, 1885. 



Genus DELTATHERIUM, Cope \ 

 Syn. Lipodectes, Co-pe^. 



Dentition : — I. g, C. \, Pm. g, M. g. 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 ^ 



S}Ti. Lipodectes penetrans, Cope '. 



This is the type species. 

 Hcih. N'orth America. 



Iff. 2571* Fragment of the right maxilla, showing portions of three 

 hinder cheek-teeth ; from the Paerco Eocene of Xew 

 Mexico. This and the next specimen agree precisely 

 with the corresponding portions of the skull figured by 

 Cope in the ' Amer. IN" at.' vol. xviii. p. 352, fig. 20. 



Presented by R. LydehTcer, Esq., 1885. 



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

 from New Mexico. Presented by B. LydcMtr, Esq., 1885. 



^ Bull. Soc. Pbilom. Paris, ser. 6, vol. x. p. 87 (1873) — Cz/noki/cenodon. 



^ Loc. cit. 



3 Amer. Nat. vol. xviii. p. 351 (1884;. 



^ Ibid. vol. XV. p. 337 (1881). 



5 Ibid. vol. XV. p. 1019 (1881). 



^ aid. vol. XV. p. 337 (1881). 



" Ibid. vol. XV. p. 1019 (18S1). 



