30 TJNGULATA. 



but this can scarcely be regarded as a specific character. Cope 1 has 

 recorded the species from North America, but it is not very apparent 

 how this form differs from the closely allied M. obscurus, Leidy 2 , 

 which it has been thought may be only a local race of the European 

 species 3 . 



37243. The cranium, in a much crushed condition, and wanting the 

 greater portion of the incisors ; from the Middle Miocene of 

 Sansan (Gers), France. On the right side the three true 

 molars, and on the left m- 2 and m. 3 are in position ; m. 3 

 is but slightly worn. Purchased, 1857. 



37242. Two upper incisors ; from Sansan. The following specimens 

 with the same number belong to the same individual. 



Purchased, 1857. 



M. 2896. An upper incisor ; from Sansan. Purchased. 



M. 2895. An imperfect upper incisor ; from Sansan. Purchased. 



40733. The terminal half of an upper incisor; from Sansan. 



Presented by C. Falconer, Esq., 1867. 



40738. The third upper premolar ; from Sansan. 



Presented by C. Falconer, Esq., 1867. 



29674. The third right upper milk-molar ; from the Middle Miocene 

 of Simorre (Gers). Presented by M. E. Lartet, 1855. 



40737. The much-worn third right upper milk-molar ; from Sansan. 



Presented by C. Falconer, Esq., 1867. 



40742a. The germ of the fourth right upper milk-molar; from 

 Simorre. Presented by C. Falconer, Esq., 1867. 



40736. The fourth left upper milk-molar, in a very early stage of 

 wear ; from Sansan. Presented by C. Falconer, Esq., 1867. 



29638. Cast of the third left upper milk-molar, in a half- worn con- 

 dition. The original is from Sansan. 



Hastings Collection. Purchased, 1855. 



1 Amer. Nat. vol. xviii. p. 524 (1884). 



2 See 'Extinct Vertebrate Fauna of the Western Territories' (Rep. U.S. 

 Geol. Surv.), pi. xxii. figs. 1-4 (1873). The tooth figured in plate xxi. figs. 1 

 and 2 of the same work has been regarded by Cope (Proc. Amer. Phil. Soc. 

 vol. xxii. p. 5 [1884]) as distinct, and is renamed Mastodon (Dibelodon) 

 shepardi, Leidy. 



3 See ' Palaeontologia Indica,' op. cit. pp. 28, 29. 



