62 PACHYDERMATA. 



have not yet been found in situ, and the specimens which have 

 been assigned to them are, in consequence, in a great measure 

 conjectural determinations. The first was probably a simple tooth 

 consisting of a pair of cusps ; and the second, reasoning from the 

 analogy of the same tooth in the nearly- allied M. Andium, was 

 probably three ridged. The third is represented by the ' dent de 

 Saxe' (Oss. Foss. pi. 2. fig. 2.), upon which Cuvier founded his 

 nominal species of M. Minutus, but which M. de Blainville, with 

 reason, attributes to M. angustidens. It is of the left side of the 

 lower jaw ; the crown is divided into three ridges, each composed 

 of two pairs of confluent points, with a well-developed back talon 

 of two tubercles, and one or two subordinate tubercles in the 

 spaces between the ridges. The dimensions of this specimen are 

 3.25 inches long, by 1.25 of width in front, and 1.65 behind. An 

 unworn germ, of unknown origin, in the British Musuem, of the 

 same size as the Saxon tooth, and exactly resembling it in the 

 ternary division and form of the crown ridges, furnishes another 

 example of the third inferior molar. M." de Blainville (loc. cit. pi. 

 15. fig. 3 b,) attributes the same place to a worn three-ridged 

 tooth, from the collection of M. Lartet, found near Sansans. 



We have seen that the premolars, of which two are developed 

 in Dinotherium, appear to be entirely suppressed in M. Ohio- 

 ticus. But there is no doubt about the presence of one in the 

 upper jaw of M. angustidens. A beautiful illustration of this 

 tooth is furnished by the Dax specimen, previously referred to. 

 As figured in the ' Ossemens Fossiles,' (pi. 3. fig. 2 a b) it 

 is shewn as a germ of a square form and composed of four 

 points. It is proved to be a premolar, and to be protruded 

 vertically in the ordinary manner, by being unworn, while the third 

 milk molar behind it has the three ridges well affected by wear. 

 This circumstance is clearly indicated by Cuvier in his description 

 of the specimen. 1 Von Meyer refers to the same tooth, the Geor- 

 gensmiind specimen represented in tab. 1. fig. 1. of his Memoir, 

 which resembles the Dax specimen in form, and in the crown being 

 composed of four points; it measures about 1.6 inches square. 



1 Ossemens Fossiles, torn. i. p. 256. 



