244 RODENTIA. 



M. 1627 a. Five rami of the mandible ; from the Upper Eocene of 

 Caylux. These specimens agree with the mandible figured 

 by Filhol in the Ann. Sci. Geol. vol. vii. pi. xii. fig. 16, and 

 also with the less perfect one figured by Schlosser, loc. cit. 

 pi. iii. figs. 6, 11. The length of the space occupied by 

 the four cheek-teeth in the specimen in which the pre- 

 molar is present is 0,0121, and the depth of the ramus at 

 the second true molar 0,009. Purchased, 1884. 



Trechomys intermedius, Schlosser 1 . 

 This species is smaller than the last. 

 Hob. France. 



M. 1348 a. Part of the right ramus of the mandible, showing the 

 four cheek-teeth and the incisor ; from the Upper Eocene 

 of Caylux (Tarn-et-Garonne), France. This specimen 

 agrees precisely with the type mandible figured by 

 Schlosser, loc. cit. pi. iii. figs. 21, 24, 28. Purchased, 1884. 



Family OCTODONTID^ 2 . 

 Dentition : I. J, C. J, Pm. \, M. | ; except in Ctenodaetylus (Pm. ?). 



Genus LONCHERES, Illiger 3 . 



Loncheres, sp. 

 Hub. S. America. 



18898. Anterior extremity of the left ramus of the mandible, show- 

 ing the incisor and the first two cheek-teeth; from a 

 cavern in Minas Geraes, Brazil. H. Gervais and Ame- 

 ghino 4 mention one fossil species under the name of 

 L. affinis eleyans. Claussen Collection. Purchased, 1845. 



Genus CARTERODON, Waterhouse 5 . 

 Incisors broad and furrowed longitudinally; upper cheek-teeth 

 with one inner and two outer enamel-folds ; the lower similar, but 

 reversed. The genus was originally described from a fossil, but has 

 subsequently been found existing. 



1 Palseontographica, vol. xxxi. p. 55 (1884). 



2 It is not improbable that this family should be fused with the last. 



3 Prodromus Syst. Mamm. p. 90 (1811). 



* Les Mammiferes fossiles de 1'Amerique du Sud, p. 59 (1880). 

 8 Natural History of the Mammalia, rol. ii. p. 351 (1848). 



