104 PROCEEDINGS OF THE GEOLOGICAL society. [Nov. 3, 
detected a closer resemblance to the Anoplotherium than the same 
teeth of the typical genus Anthracotheriwn present. 
Cuvier briefly describes the fossil teeth of the species referred to, ina 
supplementary note to his concluding volume of the ‘Ossemens Fos- 
siles*’: they were discovered in a freshwater eocene deposit mingled 
with gypsum in the neighbourhood of Puy-en-Velay, by M. Bertrand 
Roux, or de Doué, as Prof. de Blainville writes, who cites his excel- 
lent figure of a jaw of this species in a memoir on the geology of the 
‘Bassin du Puy,’ which I have not yet seen. Cuvier says that the 
upper molars of this Anthracotherioid differ from those of the typi- 
cal Anthracotherium (A. magnum) of Cadibona in being “ larger than 
they are long:” ‘‘and they would also resemble,” he says, “the 
teeth of the Anoplotherium, were it not that their external surface is 
excavated by two deep grooves, one for each pomt. The tooth that 
precedes the last three (true) molars is quite like its correspondent in 
the Anoplotherium +. Cuvier, with his usual judicious reserve, re- 
frains from assigning to these fragments a formal generic or specific 
name; but later acquisitions demonstrate that the Anthracotherioid of 
the Puy-en-Velay differed from the typical Anthracotherium im the 
smaller proportions of the canines, in a different relative position of 
the first premolar, and in modifications of the crown of the inferior © 
molars corresponding in degree with those in the upper molars. 
M. de Blainville has recently published good figures of the in- 
structive and more perfect fossils of the Anthracotherioid from the 
Puy-en-Velay{, and adopts M. v. Meyer’s indication of its specific 
distinctness, by adding, as in the ‘ Palzeologica’ (1832), p. 82, to Cu- 
vier’s “‘ Anthracothére du Velay,”’ which was a reference to its loca- 
lity, the Latin bmomial of Anthracotherium velaunum. 
The Anthracotherioids discovered by Lady Hastings in the Isle of 
Wight belong to the same aberrant section as the one from Puy-en- 
Velay by the modification of the molar teeth, and the generic distine- 
tion from Anthracotherium proper is more decisively established by 
the more complex premolars. For this genus I propose the name of 
Hyopotamus ; and for the species from the Insula Vectis on which it 
is founded, that of H. vectianus: a larger species indicated by mo- 
lars as big as those of the Ox, I propose to call Hyopotamus bovinus. 
The generic characters, as indicated by the upper grinders, are well 
displayed in the specimens belonging to Hyopotamus vectianus, 
figured in Plate VII. figs. 6 & 7; more especially by the teeth p 3 
and p 4. 
The characters of the true molars are boldly marked in those of 
the larger species, Hyopotamus bovinus. The crown of the tooth, 
probably the last true molar of this species (fig. 1), is quadrate ; its 
transverse diameter (0°032) exceeding the antero-posterior diameter 
(0:029), and beig twice the vertical diameter of the enameled 
crown. This supports five three-sided pyramidal lobes, four of which 
are normal, in two pairs (0, o' & 7, 7), and answer to the four sym- 
metrical lobes in Merycopotamus, the Ruminantia, and Anoplothe- 
* Tom. v. part ii. p. 506, 4to (1824). + Tom. cit. 
t Ostéographie, fase. xxi. Anthracotherium, pl. 1. . 
