96 



FAUNA ANTIQUA SIVALKNSIS. 



two teeth whicli it contains, tlie anterior (or penultimate) 

 had been a long time in use, and is very miich worn. It is 

 nearly rectangular in form, and the crown is distinctly 

 divided into three discs, which indicate the same number of 

 ridges. JSTo back ' talon ' is distinguishable, the abrasion of 

 the last ridge being far advanced. The dimensions of this 

 tooth are 4*5 inches long by 2"75 of width in front, and 2"6 

 behind. It is described by M. de Blainville as the fourth, 

 or antepenultimate.^ The posterior tooth in this specimen, 

 being the third, or last true molar, like its equivalent in 

 M. Ohioticus, is moi'e complicated in form than the two which 

 immediately precede it. The crown consists of four ridges, 

 each composed of two pairs of confluent points, arranged 

 somewhat alternately, and there is no distinct heel ridge 

 appended to the posterior extremity. This tooth is wide in 

 front, and contracts very considerably backwards, a character 

 common in most species of mastodon, to the last molar of the 

 tapper jaw. The dimensions are — length, 6" 25 inches ; width 

 in front, 3-25 ; width behind, 2*25. The palseontological 

 gallery of the Paris Museum contains numerous other speci- 

 mens of the last upper molar of M. angusticlens, four of which, 

 from different localites, have been admirably' figured^ in the 

 ' Osteographie.' They all agree in having the crown inva- 

 riably divided into four ridges ; the only variety which they 

 present being in the greater or less development of the ' talon ' 

 appendage of the last ridge. Of these, the sui^erb Tournans 

 specimen,^ which comprises'' the palate with one tooth on 

 each side, and the greater part of the lower jaw, shows a 

 third upper true molar, whicli resembles very closely the one 

 described above. It is entire ; of the four ridges the two 

 anterior are worn, and the two posterior intact. This tooth 

 measures 6*25 in length by 3" 25 of width in front, and 2*5 

 behind, dimensions which are almost identical with those 

 yielded by the other specimen. M. de Blainville describes all 

 these teeth as ' penultimates ;' and he adds, ' II est tres 

 singulier, que dans la grande quantite de dents diE. angusticlens 

 que M. Lartet a envoyees an Museum il n'y a pas une seule 

 sixieme d'en haut.' •' But, in our view, the teeth, which are 

 figured and described in the ' Osteographie,' as representing 

 the ' fifth,' do, in reality belong to the ' sixth ' of antero- 

 posterior succession in this species, M. de Blainville's idea of 

 the sixth or last upper grinder, in M. angustidens, being derived 

 from a tooth of more complicated form in another species. 



• De BlainTille, loc. cit. p. 296, pi. xv. 

 fig. 4 h sup. 



- Ihid. fig. 5 a, b, c, d, sup. 

 ^ Ibid. pi. xiv. 



^ Here terminates the portion of let- 

 ter-press already published. — [Ed.] 

 " P. 298. 



