414 CH@ROPOTAMUS. 
Cuvier had recognized amongst the fossil fragments 
extracted from the gypsum at Montmartre, indications 
of extinct genera different from the Palaotheria and Ano- 
plotheria, and to one of the rarest and least satisfactorily 
represented of these he gave the name of Chwropotamus. 
The fossil figured at the head of the present section 
not only extends, by its association in the same deposit 
with Paleotheria and Anoplotheria, the analogies of the 
eocene marls of the Isle of Wight with the gypsum beds 
at Paris, but affords additional information of the osteology 
and dentition of the extinct genus, which is essential to the 
determination of its exact affinities. 
The fossil in question is the right ramus of the lower 
jaw, with all the teeth in place, except one premolar, the 
canine and the incisors. It was discovered by the Rey. 
D. Fox, in the Seafield quarry, near Ryde, Isle of Wight. 
The fragments of the Chwropotamus which Cuvier * de- 
scribes, consist of an incomplete base of the skull with six 
molar teeth on each side, (fig. 164, 4) and a small portion 
of a ramus of the lower jaw, with the canine (2) and two 
spurious molars. 
The form of the teeth, and the flattened surface of 
the glenoid cavity, afford sufficient proof of the pachyder- 
mal nature of the animal, and its close alliance to the 
genus Sus. But the breadth of the glenoid cavity and the 
expansion of the zygomatic arches are greater than in any 
known species of Hog; the Peccari (Dicotyles) in these 
respects, as in the dental details, especially in the propor- 
tion and direction of its canine teeth, approaches nearest to 
the fossil. 
Now the points in which the Cuvierian fossils prove that 
the Cheropotamus deviates from the Peccari, are those 
* © Ossemens Fossiles,’ ed. 1822, vol. ii. p. 260 ; pls. Ixviii. li. 
