THERIDOMYIDA. 5 5 
Genus THERIDOMYS, Jourdan’. 
Cheek-teeth rooted, with three or four reentering enamel-folds, 
which become isolated enamel-loops on the worn crowns (Alston). 
The structure of the cheek-teeth approaches that of some species of 
Loncheres and Echinomys; the humerus referred to the fossil differs 
from that of the recent genera in possessing a supracondylar per- 
foration, 
Theridomys lembronicus (Bravard’). 
Syn. Neomys lembronicus, Bravard?. 
Theridomys dubius, Pomel *. 
This species is of relatively large size; on the worn crowns of the 
upper cheek-teeth the large internal enamel-fold persists, and there 
are four enamel-islands on the outer side. 
flab. Europe. 
34946. The palate, showing the cheek-teeth of both sides; from the 
Lower Miocene of Antoin (Puy-de-Déme), France. This 
specimen agrees very closely with the one figured by 
P. Gervais in the Zool. et Pal. Francaises, 2nd ed. pl. xlvii. 
figs. 1, la. The length of the space occupied by the four 
cheek-teeth is 0,011. 
Bravard Collection. Purchased, 1852. 
34922. The cheek-dentition of the left side; from the Lower Miocene 
of Antoin. Bravard Collection. Purchased, 1852. 
34924. The first three cheek-teeth of the right side, in a well-worn 
condition ; from the Lower Miocene of Antoin. 
Bravard Collection. Purchased, 1852. 
27760. The palate, showing the cheek-dentition of both sides; from 
the Lower Miocene of Sauvetat (Puy-de-Dome). 
Croizet Collection. Purchased, 1848. 
27715. The right ramus of the mandible, showing the incisor and 
the two first cheek-teeth; from the Lower Miocene of 
St. Yvoine (Puy-de-Doéme). 
Croizet Collection. Purchased, 1848. 
1 Comptes Rendus, vol. v. p. 483 (1837). 
2 Consid. s. la Distrib. d. Mamm. Foss. du Puy-de-Déme, p. 40 (1844), ‘este 
P. Gervais, Neomys. 3 Loe. cit. 
* Catalogue Méthodique, p. 34 (1853). 
