252 KODENTIA. 



Geraes, Brazil. In the absence of figures, it is impossible 

 to say to which of the four species established by Gervais 

 and Ameghino these specimens belong. 



Claussen Collection. Purchased, 1845. 



Genus ISSIODOROMYS, Blainville * (ex Croizet). 

 Cheek-teeth rootless, with open re-entering enamel-folds dividing 

 their crowns into heart-shaped lobes ; the subsidiary folds only 

 represented here and there by a minute enamel-island. There has 

 been considerable doubt as to the serial position of this genus. It 

 was placed by Alston among the TTieridomyidce ; but it is very 

 closely allied to the next genus, which Schlosser considers allied to 

 Dolichotis. 



Issiodoromys pseudanaema, P. Gervais 2 . 

 Syn. Palancema antiqua, Pomel 3 . 



Hob. France. 



27768. The palate, with the cheek-teeth ; from the Lower Miocene 

 of Perignat, near Issoire (Puy-de-D6me), Prance. 



Croizet Collection. Purchased, 1848 



34901. The upper cheek-dentition; from the Lower Miocene of 



Sauvetat (Puy-de-D6me). 



Bravard Collection. Purchased, 1852. 



34902. The nearly complete right ramus of the mandible ; from the 



Lower Miocene of Sauvetat. 



Bravard Collection. Purcftased, 1852. 



27691. Fragment of the left ramus of the mandible ; from the 

 Lower Miocene of Perignat. 



Croizet Collection. Purchased, 1848. 



26717. Part of the left ramus of the mandible, containing all the 

 cheek-teeth; from the Lower Miocene of Cournon (Puy- 

 de-Dome). Croizet Collection. Purchased, 1848. 



M. 1495. Fragment of the right ramus of the mandible, containing 

 the anterior cheek-teeth; from the Upper Eocene of 

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

 indistinguishable from No. 26717. The species is not 

 recorded by Filhol or Schlosser from the phosphorites. 



Purchased, 1884. 



1 Comptes Eendus, vol. x. p. 932, note (1840). 



2 Zool. et Pal. Fransaises, 1st ed. vol. i. p. 27 (1848-52). 



3 Catalogue Methodique, p. 41 (1853). 



