DINOCEEATA. 559 



those seen in the genus named in that the internal portion is much smaller 

 than the external, having a small conic apex, distinct from that of the exte- 

 rior portion. Its postero-external face is nearly vertical, and it diverges a 

 little posterior to parallel with the anterior crest. The latter (the first cin- 

 gulum) is elevated, and is wideh* separated externally from the posterior 

 crest, to whose base it descends on the external extremity of the crown. 

 The basal cingulum is present all round the crown except at the base of the 

 posterior crest, and externally. It is narrow on the inner extremity of the 

 crown. It sends upwards a strong branch to the apex of the internal cusp. 

 The enamel of all the molars is strongly wrinkled, but is worn smooth wher- 

 ever rubbed. 



Measurements. m. 



Length of superior molar series 179 



Length of premolar series 085 



DiametersP-m.ii^'^°t«™P"«'*^"<"" ^^^ 



< transverse 025 



Diameters M. i 5 ''"''''■"P*'^*''''" ^^^ 



( transverse 032 



Diameters M.ii^'*"*''™P°^t«™"^ 036 



( transverse 042 



I anteroposterior 0285 



DiametersM.iiis transverse 041 



( vertical 015 



The Metalophodon testis differs from the M. armatus in the more trian- 

 gular form of its penultimate superior molar. Its form is quite different 

 from that of the last molar, while in 31. armatus the two teeth resemble each 

 other closely. The species are of about the same size. The individual from 

 which the above description is taken is rather aged. 



DINOCERATA. 



The characters of this suborder have been already pointed out and 

 discussed. The differences from the Pantodonta are well marked, but the 

 resemblances are such as to render it impossible to refer the Dinocerata to 

 a different order. Their strong resemblances to the Prohoscidia are gener- 

 ally admitted, but the few characters Avhich distinguish them are of the 

 first importance. These are, first, the very small size of the brain, es^^e- 

 cially of the cerebral hemispheres, and, second, the double distal articula- 

 tion of the astragalus, where the facet for the cuboid bone is nearly as large 

 as that for the navicular. 



