HYSTRICID #. Q47 
the first and second true molars, the teeth in both speci- 
mens being in an early stage of wear and in beautiful 
preservation. The specimens are provisionally referred 
by Waterhouse, in the passage quoted, to the present 
genus, and are said to be too small to belong to Lund’s 
S. magnus; the description of that form seems, however, 
to be too vague to be certain on this point. The following 
dimensions show the length of the space occupied by the 
three true molars in the more perfect fossil and in two 
specimens of the existing Hrethizon dorsatus, viz. :— 
S. fossilis. E. dorsatus. 
0,0238 0,0208-0,0195. 
The superior size of these specimens probably indicates 
at least their specific distinction from Hrethizon dorsatus. 
If they are identical with Synetheres magnus, that name 
has the priority over S. fossils. 
Claussen Collection. Purchased, 1845. 

Genus H'YSTRIX, Linn.'* 
The teeth of this genus are indistinguishable from those of Athe- 
rura; but none of the living species of the latter attain anything 
like the dimensions of the larger species of Hystria. 
Fiystrix refossa, P. Gervais’. 
Syn. Hystrix major, P. Gervais ° (teste Schlosser). 
Hab. France. 
34958-9. A right upper premolar and a first or second left upper 
true molar*; from the Upper Pliocene of Perrier (Puy-de- 
Dome), France. The premolar appears to agree exactly 
with the lower premolar figured by P. Gervais in the Zool. 
et Pal. Francaises, pl. xlviu. fig. 11, and both specimens 
agree with the type in the complexity of the enamel-folds: 
they appear rather larger than average specimens of H. 
cristata, and thereby approach the Pleistocene so-called 
H. major. Bravard Collection. Purchased, 1854. 
34957. Fragment of the base of the incisor, associated with the 
above. Bravard Collection. Purchased, 1854. 
1 Syst. Nat. ed. 12, vol. i. p. 76 (1766). 
2 Zool. et Pal. Frangaises, 1st ed. vol. ii., explanation of pl. xlviii. (1848-52), 
3 Zool. et Pal. Générales, Ist ser. p. 76 (1876-79). 
4 Wntered in the Register as Castor elaveris, Bravard, MS. 
