40 TTNGULATA. 



Mastodon pentelici, Gaudry and Lartet \ 



Syn. Tetrabelodon pentelici, Cope 2 . 



This species is at present unrepresented in the Museum Collection, 

 although it is important that it should be noticed here ; at present 

 it appears to be only known by immature specimens. In mm. 4 the 

 ridges are interrupted and the valleys partially blocked by accessory 

 tubercles ; the hind talon of mm. 3 is so largely developed as prac- 

 tically to form a third ridge (woodcut, fig. 9). The mandibular 

 symphysis is produced to a considerable extent, and is furnished with 

 incisors ; but premolars do not appear to have been developed. The 

 ridges of the milk-molars appear to be lower than in M. pandionis. 



Fig. 9. 



Mastodon pentelici. — The left upper milk-molars ; from the Lower Pliocene of 

 Pikermi. |. (After Gaudry's ' Enchainements.') 



Hah. Greece, Hungary 3 , and North-west Persia 4 (Lower Plio- 

 cene). 



Mastodon falconeri, Lydekker 5 . 



This species is of very large size, and apparently has a short and 

 incisor-less mandibular symphysis; the cheek-teeth present trefoils 

 on one column of each ridge and resemble in general structure those 

 of M. angustidens, although they are much larger and relatively 

 wider. The species may be a more specialized descendant from the 



1 Comptes Rendus, vol. xliii. p. 273 (1856). — M. pentelicus. 



2 Proc. Amer. Phil. Soc. vol. xxii. p. 5 (1884). 



3 See Petho, Jahresb. k. ung. geol. Anstalt, 1884, p. 63. 



4 See Lydekker, Quart, Journ. Geol. Soc. vol. xlii. p. 173 (1886). 

 6 Rec. Geol. Suit. Ind. vol. x. p. 83 (1877). 



