Nyctereutes Temminck. 
B. MEGALOTINAE. 
Megalotis Blainv.=Agriodus H. Smith=Otocyon Licht. 
Extinct Canidae? incertae sedis. 
Amphicyon Lartet. 
Cynodon Aym. 
Galecynus Owen. 
Paleocyon Lund, (not Blainy.) 
Speothos Lund. 
SUPER-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 emarginated. 
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. M1}; 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. M1}; first true molar (sectorial) of lower jaw only developed. Toes 
straight, with the last phalanges and claws extended; the latter 
non-retractile. (Gray.) 
MELLIVORINAE. 
2. Last molar of upper jaw (M =) enlarged and more or less extended 
longitudinally.—M }. Toes straight, with the last phalanges and 
claws extended; the latter non-retractile. (Gray.) 
(C.) 
MELINAE, (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. 
HELICTIDINAE, (,) 
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. 
