THERIDOMYID&. BT 
27760. Three fragments of the mandible; from the Lower Miocene 
of Sauvetat. Croizet Collection. Purchased, 1848. 
27636. Part of the left ramus of the mandible, showing the first 
three cheek-teeth and the complete incisor; from the 
Lower Miocene of Sauvetat. 
Croizet Collection. Purchased, 1848. 
34944—5. Fragments of the cranium and mandible; from the Lower 
Miocene of Antoin. 
Bravard Collection. Purchased, 1852. 
Theridomys aquatilis, Aymard’. 
Syn. Theridomys jourdani, Aym. (non Gieb.). 
Isoptychus jourdant, Pomel’. 
Lsoptychus aquatilis, Pomel?. 
? Theridomys rotundidens, Schlosser *. 
? Theridomys cuviert, Pomel. 
This species is considerably smaller than the last, the average 
length of the space occupied by the upper cheek-teeth being 0,008, 
and that by the lower 0,010. The four cheek-teeth are nearly equal 
in size, and there are only three distinct enamel-islands on the worn 
crowns of the upper teeth. 
Hab. Europe. 
27756. The palatal portion of the cranium, showing the left incisor 
27756 a. 
and the four cheek-teeth of either side; from the Lower 
Miocene of Cournon (Puy-de-Déme), France. This spe- 
cimen agrees precisely with the one figured by P. Gervais 
in the Zool. et Pal. Francaises, 2nd ed. pl. xlvi. figs. 7, 
7a, and by Filhol in the Ann. Sci. Géol. vol. xii. pl. vi. 
fig. 12. The length of the space occupied by the four 
cheek-teeth is 0,009. 
Croizet Collection. Purchased, 1848. 
The nearly complete left ramus of the mandible, containing 
the incisor and the four cheek-teeth ; from the Lower 
Miocene of Cournon. This specimen agrees very closely 
with the mandibles figured by P. Gervais (op. cit. fig. 6) 
and Filhol (op. cit. fig. 14). The length of the space 
occupied by the four cheek-teeth is 0,010. 
Croizet Collection. Purchased, 1848. 
t Ann. Soe. Agric. Sci. le Puy, vol. v, p. 82 (1850), zeste Filhol. 
* Catalogue Méthodique, p. 35 (1853). This species is identified with agua- 
tilés on the authority of Filhol, Ann. Sci. Géol. vol. xii. art. 3, pp. 14, 16. 
& Lind. 
* Paleontographica, vol. xxxi. p. 38 (1884). 
