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. Géol. vol. vii. pl. xii. fig. 16, and 
also with the less perfect one figured by Schlosser, Joc. cit. 
pl. 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 *. 
This species is smaller than the last. 
Hab. 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. pl. 111. figs. 21, 24,28. Purchased, 1884. 
Family OCTODONTIDZ’. 
Dentition :—I. 2 C. oa JEio, > M. - ; except in Ctenodactylus (Pm. as 
Genus LONCHERES, [Illiger’. 
Loncheres, sp. 
Hab. 8. 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* mention one fossil species under the name of 
L. affinis elegans. Claussen Collection. Purchased, 1845. 
Genus CARTERODON, Waterhouse ’. 
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 Paleontographica, vol. xxxi. p. 55 (1884). 
* It is not improbable that this family should be fused with the last. 
$ Prodromus Syst. Mamm. p. 90 (1811). 
* Les Mammiferes fossiles de l’Amérique du Sud, p. 59 (1880). 
5 Natural History of the Mammalia, vol. ii. p. 351 (1848). 

