243 



cheek-teeth ; from the Lower Miocene of the neighbourhood 

 of Clermont (Puy-de-D6me). 



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-D6me). 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 1 . 



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 2 ). 



Syn. Theridomys platyceps, Filhol 3 . 

 Trechomys insignis, Schlosser 4 . 



Schlosser had some doubts whether his Trechomys insignis was 

 the same as Filhol's Theridomys platyceps : the specimens in the 

 Museum show decisively that this is the case. 



Hob. 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. cit. pi. iii. figs. 16, 23. 



Purchased, 1884. 



1 Ann. Sci. Nat. vol. xii. p. 151 (1869). 



2 Ann. Sci. CWol. vol. vii. art. 7, p. 50 (1876). 3 Loc. cit. 

 4 Palaeontographica, vol. xxxi. p. 54 (1884). 



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