THEBIDOMYIDJE. 235 



Genus THERIDOMYS, Jourdan 1 . 



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 2 ). 



Syn. Neomys lembronicus, Bravard 3 . 

 Theridomys duUus, Pomel 4 . 



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. 



Hob. Europe. 



34946. The palate, showing the cheek-teeth of both sides ; from the 

 Lower Miocene of Antoin (Puy-de-D6me), France. This 

 specimen agrees very closely with the one figured by 

 P. Gervais in the Zool. et Pal. Frangaises, 2nd ed. pi. xlvii. 

 figs. 1, 1 a. 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-D6me). 



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-D6me). 



Croizet Collection. Purchased, 1848. 



1 Comptes Eendus, vol. v. p. 483 (1837). 



' 2 Consid. s. la Distrib. d. Mamm. FOBS, du Puy-de-D6me, p. 40 (1844), teste 

 P. Gervais, Neomys. 3 Loc. cit. 



4 Catalogue Methodique, p. 34 (1853). 



