CHAP. XVII.] MAMMALIA. 231 



an extinct genus, Eiimys, in the Upper j\Iiocene of Dakota, and 

 another, Mysojys, in the Eocene of Wyoming. 



In South America Mus, or more probably Hc^pcromys, is 

 abundant in Brazilian caverns, and OxT/myctcrus in the Pliocene 

 of La Plata ; while Arvicola is said to have occurred both in tlie 

 Pliocene and Eocene deposits of the same country. 



Family 56.— SPALACID.^. (7 Genera, 17 Species.) 



Geneeal Distribution. 



NroTROPiCAL Nearctic I Pai,.earctic ETHiopiA>f I Oriental I Atstraliav 

 Stb-regions. Sub-regions. Sub-iiegiosh. Sub-rkgioks. Scn-uEcioN';. Sub-regions. 



I I 1.2,3— 1.2.3-^ i 1 -3.4. 



I I I ^ ! 



The Spalacidffi, or mole-rats, have a straggling distribution over 

 the Old World continents. They arc found over nearly the whole 

 of Africa, but only in the South-east of Europe, and W^est of 

 Temperate Asia, but appearing again in North India, ^Malacca, 

 and South China. Elldbhis (1 sp.), is found in South Pussia 

 and South-west Siberia ; Spalax (1 sp.). Southern Russia, West 

 Asia, Hungary, Moldavia, and Greece (Plate II., vol. i. p. 218) ; 

 Bhizamys (6 sp.), Abyssinia, North India, jMalacca, South China ; 

 HeterocepJialus (1 sp.), Abyssinia ; Bathycrges (= Orycterus 1 sp.), 

 South Africa ; Georychus (6 sp.), South, Central, and East Africa ; 

 Jleliophoh's (1 sp.). Mozambique. 



Family 57.— DIPODID^E. (3 Genera, 22 Species.) 



General Distribution. 



Neotropical 

 Sub-regions. 



Nearctic 

 Sub-regions. 



pal.earctic 

 Sub- regions. 



Ethiopian 



SrB-REGION".S. 



Oriental 

 Sub-regions. 



Australian 

 Sub-regions. 



1.2.3.4-2.3.4- 1.2.3- 



The Jerboas, or jumping mice, are especially characteristic of 

 the regions about the eastern extremity of the Mediterranean, 

 being found in South Russia, the Caspian district, Arabia, Egypt, 



