THERIDOMYID&. 943 
cheek-teeth ; from the Lower Miocene of the neighbourhood 
of Clermont (Puy-de-Déme). 
Croizet Collection. Purchased, 1848. 
27713. Part of the palate, containing the first three cheek-teeth of 
the right side ; from the Lower Miocene of Perignat (Puy- 
de-Dome). Croizet Collection. Purchased, 1848. 
34898. The nearly complete left ramus of the mandible; from the 
Lower Miocene of Perignat. 
Bravard Collection. Purchased, 1852. 
34899. The greater part of the right ramus of the mandible; from 
the Lower Miocene of Perignat. 
Bravard Collection. Purchased, 1852. 
27634. Fragment of the right ramus of the mandible, containing 
the premolar ; from the Lower Miocene of Perignat. 
Croizet Collection. Purchased, 1848. 
Genus TRECHOMYS, Lartet’. 
Upper cheek-teeth with four outer and one or two inner enamel- 
folds ; lower teeth usually with three inner and one outer enamel- 
fold. The general structure of the cheek-teeth is somewhat similar 
to that of Theridomys, but the incisors are distinguished by their 
lateral compression. 
Trechomys platyceps (Filhol’). 
Syn. Theridomys platyceps, Filhol®. 
Trechomys insignis, Schlosser *. 
Schlosser had some doubts whether his 7’rechomys insignis was 
the same as Filhol’s Theridomys platyceps: the specimens in the 
Museum show decisively that this is the case. 
Hab. France. } 
M. 1627. Two fragments of the maxilla, showing some of the cheek- 
teeth; from the Upper Eocene of Caylux (Tarn-et-Garonne), 
France. These specimens agree precisely with the maxilla 
figured by Schlosser, loc. c7é. pl. 111. figs. 16, 23. 
Purchased, 1884. 
1 Ann. Sci. Nat. vol. xii. p. 151 (1869). 
2 Ann. Sci. Géol. vol. vii. art. 7, p. 50 (1876). 8 Loc. cit. 
4 Palwontographica, vol. xxxi. p. 54 (1884). 
RZ 
