CARNIVORA. 211 



i». With 3 lower premolars; no alisphenoid canal; bulla not 

 divided or constricted, with only a rudiment of a septum ; 

 metatarsus hairy ; claws blunt and not retractile. 



[=Hyaenidae.] 



Hyaena, p. 258. 



^ Digltigrade, with non-retractile claws ; condylar foramen dis- 

 tinct from the foramen lacerum posterius; paroccipilal 

 process closely applied to the bulla ; clavicles rudimentary ; 

 last upper premolar and first lower molar sectorial. 



[=Cynoidea.] 



h. A sinus in the frontal bone, postorbital process large, thick 

 and swollen and bent down at the tip. 



y. With only two true molars in the lower jaw, i.e., the lower 

 sectorial and one other ; contour of facial line convex. 



Cuon, p. 260. 



/*. With a complete set of three true molars in the lower jaw ; 

 contour of the facial line generally concave, 



Canis, p. 261. 



h^. No sinus in the frontal bone ; skull slight and elongate ; 

 postorbital processes thin, concave above, spread out more 

 or less horizontally. Vulpes, p. 267. 



'. Plantigrade with generally non-retractile claws ; skull with 

 the condylar foramen distinct from the foramen lacerum 

 posterius ; paroccipital process widely separated from the 

 bulla ; mastoid process very large ; auditory bulla not round- 

 ed or divided ; no caecum. [=Arctoidea.] 



k. With no alisphenoid canal ; molars \ ori. 



[=Mustelidae.] 



/. Kidneys simple ; feet short, digitigrade partially webb- 

 ed ; claws short, often semi-retractile ; dentition, 

 sectorial. 



m. Premolars four above and below; lower sectorial 

 with an inner tubercle ; habits arboreal. 



Mustela, p. 273. 



n?. Premolars three above and below ; lower sectorial 

 with no inner tubercle ; habits terrestrial; 



Putoriits, p. 276. 



^. Kidneys simple ; feet elongated ;toes straight; claws 

 non-retractile, blunt ; habits terrestrial and fossorial. 



p 2 



