CARNIVORA. 211 



b^. 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. 



i^. Digitigrade, with non-retractile claws ; condylar foramen dis- 

 tinct from the foramen lacerum posterius; paroccipifal 

 process closely applied to the bulla ; clavicles rudimentary ; 

 last upper premolar and first lower molar sectorial. 



[=Cynoidea.] 



h. A sinus in the frontal bone, po&torbital 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. 



p. 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 I ox\. 



[=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. 



7)1^. Premolars three above and below ; lower sectorial 

 with no inner tubercle ; habits terrestrial. 



Putorius, p. 276. 



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

 non-retractile, blunt ; habits terrestrial and fossorial. 



p 2 



