Bibliographical Notices, 51 



IV. Macropoda. Artus distincte saltatorii, anteriores brevissimi, 

 posteriores longissimi ; cauda longa pilosa ; foramen infraorbi- 

 tale magnum. 



The four genera belonging here are divided into two sections. 



a. Dentes molares irregulariter incisi. 



Dipus ; Scirtites, mihi (Alactaga, Fr. Cuv.) ; JacvJus, Wagl. 



b. Dentes molares ab uno latere partiti. (Meriones, F. Cuv.) Pe- 

 detes. 



Geog. distrib. Over Asia and a small part of European Russia, 

 Africa, Northern America, and one occurs on New Holland. 



V. Chinchillina. Auriculae magnae j'scelides antipedibus subduplo 



longiores ; cauda producta, supra et ad apicem longius setosa ; 

 vellus molle ; dentes molares ^ e laminis 2-3 parallelis com- 

 posite 



Three genera : Eriomys {Chinchilla), Lagidium (Lagotis), Lago* 

 stomus. 



Geog. distrib. South America. 



VI. Psammorycttna. Habitus murinus, artus proportionales, au- 

 riculae mediocres (rarius magnae), foramen infraorbitale magnum, 

 mandibulae angulus in cuspidem elongatum excurrens, dentes 

 molares -J . 



a. Habrocoma. (3. Capromys. 



Octodon. Aulacodus. 



Psammoryctes. Loncheres. 



(Nelomys and Echimys.) 

 Cer corny s. 

 Dactylomys. 

 Petromys. 

 Confined principally to South America. 



VII. Cunicularia. Corpus crassum, cylindraceum, caput obtusum, 

 oculi minuti aut tecti, auricula et cauda nullae aut parvae, artus 

 anteriores posterioribus robustiores, pedes 5-dactyli, dentes pri- 

 mores exserti, lati, truncati. 



o. Ungues anteriores breves. (3. Ungues anteriores longissimi. 



Ommatostergus . Siphneus. 



Spalax. Ascomys. 



Chtonoergus. Thomomys. 



Rhizomys. Geomys. 



Georhycus. Bathyergus. 



Ctenomys. Haplodon (Aplodontia, 



Richardson) . 



Geog. distrib. South-eastern Europe, Asia, Africa and Ame- 

 rica. 



VIII. Murina. Oculi distincti, auricula et cauda plus minusve 

 exsertae, artus posteriores anterioribus longiores, pedes ante- 

 riores digitis 4 et verruca hallucari, posteriores 5-dactyli, cauda 

 nuda aut minus pilosa ; foramen infraorbitale longitudinale, 



E 2 



