64 



Nyctereutes Temminck. 



B. MEGALOTINAE. 



Megalotis Blainv. =Agriodus H. Sw.ith=0tocyon Licht. 



Extinct Canidae ? incertae sedis. 

 Amphicyon Lartet. 

 Cynodon Aym. 

 Gulecynus Owen. 

 Palceocyon Lund, (not Blainv.) 

 Speothos Lund. 



STTPER-FAMILY ARCTOIDEA, 

 XVI. MUSTELIDAE. 



SUB-FAMILIES. 



I. Skull with the cerebral portion comparatively compressed backwards ; 

 and with the rostral portion comparatively produced, attenuated, and 

 transversely convex above ; anteorbital foramen small and opening for- 

 wards. Feet with little developed or no interdigital membrane. 



A. Auditory bulla much inflated, undivided, bulging, and convex forwards ; 

 periotic region extending little outwards or backwards. Palate moder- 

 ately emargiuated. 



1. Last molar of upper jaw (M --) transverse, (with the inner ledge in- 

 flated at its inner angle ;) sectorial tooth with a single inner cusp. 



a. M \ ; First true molar (sectorial) of lower jaw followed by a small 

 second (tubercular) one. Toes short, regularly arched, and with 

 the last phalanges bent up, withdrawing the claws into sheaths. 

 (Gray.) 



MUSTELINAE. (A.) 



b. M \ ; first true molar (sectorial) of lower jaw only developed. Toes 

 straight, with the last phalanges and claws extended; the latter 

 non-retractile. (Gray.) 



MELLrVORINAE. (C.) 



2. Last molar of upper jaw (M^) enlarged and more or less extended 

 longitudinally. M -1-. Toes straight, with the last phalanges and 

 claws extended ; the latter non-retractile. (Gray.) 



MELINAB. (B.) 



B. Auditory bulla elongated and extending backwards close to the par- 

 occipital process. (Flower.) Palate moderately emarginated. 



1. Last molar of upper jaw (M--) transverse; (with the inner ledge 

 narrowed inwards): sectorial tooth with two inner cusps. 



HELICTIDrNAE. (I 1 .) 



C. Auditory bulla inflated, undivided, with the anterior inferior extremity 

 pointed and commonly united to the prolonged hamular process of the 

 pterygoid. (Flower.) Palate moderately emarginated. 



