THBBIDOMYID^!. 241 



Protechinomys gracilis, Schlosser 1 . 



This is a smaller species than the last. 

 Hob. Prance. 



M. 1348b. Fragment of the maxilla; from the Lower Eocene of 

 Caylux (Tarn-et-Garonne), France. This specimen agrees 

 with the one figured by Schlosser, loc. cit. pi. v. figs. 14, 23. 



Purchased, 1884. 



Protechinomys breviceps (Laizer and Parieu 2 ). 



Syn. Echinomys breviceps, Laizer and Parieu 3 . 



Echinomys curvistriatus, Laizer and Parieu 4 . 

 Theridomys breviceps, P. Gervais 5 . 

 Theridomys jourdani, Giebel 6 . 

 (?) Theridomys blainvillei, P. Gervais 7 . 



Schlosser (loc. cit. p. 41) observes that Theridomys blainvillei un- 

 doubtedly belongs to Protechinomys, and that it is most probably 

 identical with T. breviceps, which he likewise rqfers to Protechinomys 

 (loc. cit. p. 42). In a partially worn condition the upper molars 

 show three oblique bands of dentine. The species is about the size 

 of Theridomys aquatilis. 



Hab. France. 



27760. Part of the cranium, showing the cheek-dentition of the right 

 side ; from the Lower Miocene of Sauvetat (Puy-de-D6me), 

 France. This and the next specimen agree in all essential 

 characters with the one figured by P. Gervais in the Zool. 

 et Pal. Franchises, 2nd ed. pi. xlvii. figs. 17, 17 a, under 

 the head of Theridomys blainvillei ; but the length of the 

 space occupied by the cheek-teeth is slightly less. 



Croizet Collection. Purchased, 1848. 



27702. The left upper cheek-dentition ; from the Lower Miocene 

 of Sauvetat. Croizet Collection. Purchased, 1848. 



27760 a, 27712, 34900. Numerous specimens of rami of the man- 

 dible, several of which are nearly perfect ; from the Lower 



1 Palceontographica, vol. xxxi. p. 46 (1884). 



2 Comptes Bendus, vol. viii. p. 206 (1839), Echi[no]mys. 



3 Loc. cit. 



4 Ibid. p. 25. This name has the priority, but breviceps is very generally 

 adopted. 



5 Zool. et Pal. Francises, 2nd ed. p. 31 (1859). 



6 Fauna der Vorwelt, vol. i. p. 96 (1847). 



7 Zool. et Pal. Fran9aises, 1st ed. vol. ii., explan. pi. xlvii. (1848-52). 



