ot 
CAVIID®. a5, 
Genus NESOCERODON, Schlosser’. 
Cheek-teeth semi-rooted, otherwise very similar in general struc- 
ture to Issiodoromys, from which the present writer is inclined to 
doubt the propriety of separating the genus. The structure of the 
teeth in different stages of wear is well exhibited in Schlosser’s 
figures, loc. cit. pl. vii. It will be seen that the well-worn upper 
molars represented in fig. 12 present precisely the same general 
pattern as those of Jssiodoromys figured by P. Gervais in the Zool. 
et Pal. Francaises, 2nd ed. pl. xlvii. fig. 6 a. 
Wesocerodon quercyi, Schlosser’. 
Hab. France. 
M. 1348 d. Part of the right ramus of the mandible, containing the 
incisor and the first three cheek-teeth ; from the Upper 
Kocene of Caylux (Tarn-et-Garonne), France. This speci- 
men agrees with the mandibles figured by Schlosser, Joc. 
cu, ple val. fies, 1,./,.21. Purchased, 1884. 
Nesocerodon minor (Filhol’). 
Syn. Isstodoromys minor, Filhol *. 
This species is smaller than the last, but it is not impossible that 
it will ultimately be found that there is a transition in this respect 
between the two; in which case the present name should stand for 
the species. 
Hab. France. 
M. 1631. Fragment of the left maxilla, containing the four cheek- 
teeth; from the Upper Eocene of Caylux (Tarn-et-Garonne), 
France. This specimen agrees very closely with the one 
described by Filhol, loc. cit., and those figured ‘vy Schlosser, 
loc. cit. pl. vii. figs. 8,16, 20. The length of the space 
occupied by the four cheek-teeth in the present specimen 
is 0,008, in Filhol’s specimen 0,0075, and in Schlosser’s 
specimens 0,007 and 0,0065. Purchased, 1884. 
1 Palxontogra phica, vol. xxxi. p. 16 (1884), Nesokerodon. 
2 Loc. cit. p. 19. 
3 Ann. Sci. Géol. vol. vil. art. 7, p. 52 (1876), Isstodoromys. 
“ Loe. cit. 
