RODENTIA. 3 



laminae; palate narrow; muzzle blunt; form 

 stout ; tail shorter than the head and body. 



Nesokia, p. 53. 



k^. Incisors narrow ; molars tubercular. 



Mus, p. 59. 



k^. Like Mus, but with an extra anterior tubercle 

 to the anterior upper molar. 



Leggada, p. 79. 



f. Pollex and hallux provided with a flat nail; tail 

 very long, with a pencil of long hairs at the 

 tip ; skull very short and rounded. 



/, Dentition normal ; incisors narrow. 



Chiropodomys, p. 81. 



^. Molar teeth with cusps arranged perfectly regu- 

 larly, those of the lower jaw arranged in trans- 

 verse rows of three instead of two as in all other 

 Muridse ; incisors broad. Hapalotnys, p. 82^ 



j^. 1st and 5th digit of each limb with a flat nail; size 

 small ; form slender and agile 



Vandeleuria, p. 82. 



h*. Upper incisors grooved, otherwise as in Mus. 



Golunda, p. 83. 



h^. Upper incisors smooth ; molars tuberculate ; infra- 

 orbital opening not much narrowed below, and with 

 the perpendicular plate little developed; tail short, not 

 scaled, sparsely haired ; with large cheek-pouches. 



Cricetus, p. 85. 



g^. Molars rootless or semi-rooted, composed of triangular 

 prisms placed alternately. 



m. Infra-orbital opening murine ; tail short and hairy ; 

 ear-conch present; anterior palatine foramen 

 long. .... Arvicola, p. 87. 



m^. Infra-orbital opening small and sub-triangular; ear- 

 conch absent; anterior palatine foramen rudi- 

 mentary Ellobius, p. 94. 



f^. Incisors large and broad ; no premolars ; molars rooted 

 and with re-entering enamel folds, not tuberculate; 

 infra-orbital opening sub-triangular, with no perpendi- 

 cular plate; eyes very small; ears very short; tail 

 rather short-haired. . . . Rhizomys, p. 95- 



B 2 



