SUBORDER C 



PROBOSCIDEA 



259 



1.0.3. 



The milk dentition (Fig. 343) has the formula : w^f^- The two posterior 



1 . Kj, O, 



Fig. 342. 



Tetrabelodon angustidens Ciivier sp. Middle Miocene, Simorre (Gers), France. Restored skeleton, 

 greatly reduced. (After Gaudry.) 



milk molars are sometimes replaced from below by premolars (Fig. 343); in the 



later species, however, the milk molars 

 succeed each other from behind for- 

 MFiikli? ward, as in Elephas. The last milk 



molar and the two anterior molars 

 above and below possess an equal 



Fig. 343. 



Tetrabelodon, angustidens Cuvier sp. Middle 

 Miocene, Simorre (Gers), France. Portion of right 

 half of lower jaw, inner aspect, showing third and 

 fourth premolars (ps, 554), ready to replace last 

 milk molars (<Z2. £(»). 1/^. (After Lartet.) 



Fig. 344. 



A, Tetrabelodon angustidens Cuvier sp. Miocene, 

 tle-en-Dodon. Last lower molar. 1/4. B, Tetra- 

 belodon turicensis Scliinz sp. M. Miocene, Simorre. 

 Last lower molar, i/;,. (After Gaudry.) 



number of transverse crests ; the last molar is distinguished by an additional 

 crest and frequently by a talon also. In the species of Tetmhelodon, therefore. 



