110 PROCEEDINGS OF THE GEOLOGICAL sociery. [Nov. 3, 
and Cheropotamus in the arrangement of a dentition of precisely the 
same numerical formula, and with molars of the same type as those 
of the true Anthracotheres, do not allow of much confidence being 
placed in an arrangement of teeth adopted on an unexplained ana- 
logy. With regard to the lower jaw, it also appears from M. de 
Blainville’s description and figure of the specimen discovered by the 
Abbé Croizet, that the incisors and canines are placed in the order 
figured in his pl. 1, according to some unspecified analogy. The 
crowns of the incisors are described as being “en palette, subsymmé- 
trique,”’ 7. e. subquadrate, and with the summits worn. The second 
incisor is a little narrower than the first; the third (outermost) is 
much larger, and with the crown obliquely truncate. The canine, 
which is stated to be “‘ parfaitement en place *,”’ is a little thrust out- 
wards, and less procumbent than the incisors ; moderately strong, 
oval (?), slightly compressed and recurved in its exserted part. 
The first premolar is represented by a single and distant root, 7. e. 
it is separated by a vacant interval from the other premolars as well 
as from the canine. The second, third and fourth premolars have 
triangular, unicuspid, subcompressed crowns; a basal talon being 
developed behind the third, and of somewhat larger size behind the 
fourth. The three true molars have the same proportions (M. de 
Blainville says) as those of the “ Lophicdon de Nanterre”; but their 
transverse ridges are less thin and trenchant, and more rounded, as 
well externally as internally ; the middle part which separates the 
two mammille being less elevated, contrary to the oblique ridge, de- 
parting from the internal posterior mammilla to go to jom the exter- 
nal anterior mammilla, whence there results four mammille which, 
by usage, give rise to a little more complication of the folds of ena- 
mel, a disposition which slightly recalls that which exists m the Pec- 
caris+. The last molar is terminated by a rounded lobe or talon, 
rather narrower than the body of the tooth, but as long at least as 
the entire moiety (“aussi long au moins que la moitié totale T”’). 
M. de Blainville is led, by the subsequent acquisitions made to the 
Parisian ccliection since the time of Cuvier, to acknowledge the genus 
Anthracotherium, but he virtually abrogates the Cuvierian genus, by 
extending its characters and signification so as to admit not only the 
typical species, Anthr. magnum, but likewise the Anthr. velaunum, 
and the Dichodon, as the Anthr. minutum §: he also refers the upper 
jaw of Cheropotamus to Anthracotherium, and transfers the lower 
jaw of Cheropotamus to the genus Sus. On the other hand, M. de 
Blainville is inclined to think the Anthr. alsatiacum of Cuvier to be 
the young of the Anthr. magnum, although the crowns of the per- 
manent molars certainly indicate, as Cuvier well observes ||, “une 
espéce intermédiaire pour la grandeur entre la plus grande de Cadi- 
bona (Anthr. magnum) et la plus petite du méme lieu.” 
With respect to the Anthracotherium velaunum, M. de Blainville 
has been able to add much to the brief notice by Cuvier in the 
‘Supplement’ to the last volume of the 4th edition of the ‘Osse- 
* Ostéographie, fasc. xxi. (1846) p. 129. + Ib. p. 130. Tt #6. 
§ Ib. Anthracotherium, p. 138, pl. 3. || Ossem. Foss. t. iv. p. 501. 
