124 PROCEEDINGS OF THE GEOLOGICAL Society. [Nov. 3, 
in which case the disproportion of its bicuspid transverse lobes to 
those in the supposed anterior teeth would be truly smgular, as M. 
de Blainville is compelled to admit*. The hypothesis that the long 
and narrow anterior three-lobed and sex-cuspid tooth might be the 
last of the deciduous series, is in accordance with ordinary analogies ; 
but the entire and nearly adult jaw, with the series of teeth of the 
Dichodon, described in a former memoir, demonstrates that this An- 
thracotherioid genus, like the Dinotherium, could have a permanent 
grinder with a three-ridged crown, in advance of other grinders with 
only two transverse ridges, without such three-ridged tooth being 
necessarily the last of the deciduous series. 
M. de Blainville, m re-describing the fossil portion of the Anthra- 
cotherian jaw figured in vol. iv. pl. 39. fig. 5 of the ‘Ossemens 
Fossiles’ (ed. cit. ), says, “‘On doit voir dans le quatre dents mo- 
laires assez entiéres qui en garnissent le cété droit, un mélange évi- 
dent de deux dentitions. La troisiéme est certainement la derniére 
de lait 4 trois lobes:” and he argues thence, that instead of its be- 
longing to the dnthr. alsatiacum, it must be the young of the Anthr. 
magnum. 'The reader of the ‘Ostéographie’ might suppose, from 
the absence of any allusion to Cuvier’s perception of the real nature 
of the fossil, that the discovery of its mixed dentition was due to the 
author of the ‘Ostéographie.’ But Cuvier, in his description, ex- 
pressly says, ‘‘ cette machoire est celle d’un jeune animal, qui n’avoit 
pas enticrement changé ses dents. En effet la molaire, 6, qui précéde 
celle que nous venons de décrire, y a trois paires de collines, comme 
doit les avoir la derniére persistante, signe infaillible que celle molaire, 
b, est une dent de lait.” Now had M. de Blainville shown how this 
assertion of Cuvier’s required to be qualified, and the predicament 
shorn of its infallibility, by rightly interpreting the phenomena which 
the teeth of the Dichodon in his possession offered to his observation, 
or even by remembering the peculiar character of the adult dentition 
of the Dinotherium, he would have made a real step in advance of his 
great master, but he contents himself with repeatmg the assertion, 
that the three-lobed tooth im advance of the two-lobed molars was 
‘certainly a deciduous one.’ M. de Blainville does not repeat Cu- 
vier’s statement, that, although the jaw of the Anthr. alsatiacum was 
that of a young animal, its mature stature might be judged of by that 
of the persistent molars already in place, “‘ et qui ne changeront plus,” 
as Cuvier well remarks; and that these teeth demonstrated a species 
intermediate in stature between the Anthracotherium magnum of 
Cadibona and the Anthr. minus, of which Dr. Buckland had commu- 
nicated to Cuvier a tooth from the same locality. 
It is very true that in those Ungulates in which the last lower true 
molar has a lobe or division more than the rest, the last lower milk 
molar has the same additional division; but it is now necessary to 
* “ Ces trois dents sont assez singuliéres par la proportion des collines trans- 
verses bicuspides qui les constituent, et qui diminuent assez rapidement de la 
premiere a la derniére; c’est-a-dire que la dent antepénultiéme est sensiblement 
plus épaisse que la pénultiéme, celle-ci plus que la derniére,” &c. The reverse of 
this being the case in nature, as respects the specimen described. 
