58 
carotid canal distinct, and more or less in advance of the foramen lacerum 
posticum; condyloid foramen also distinct from the foramen lacerum 
posticum ; glenoid foramen generally well defined. Os penis very large. 
Cowper’s glands not developed.—( Arctoidea.) 
A. True molars of upper jaw one (M4; rarely—in Mellivorina—) ; 
last pre-molar of upper jaw sectorial (varely—in Enhydrine—with blunt 
tubercles). (Arctoidea musteliformia. ) 
MUSTELIDAE. (XVI.) 
B. True molars of upper jaw two; last pre-molar of upper jaw tubercular 
(rarely—in Bassaridide—sectorial). 
1. Last molar of upper jaw oblong and exceeding the first: three true 
molars in lower jaw; first narrowest but longest; second oblong and 
broader. Foramen lacerum posticum introrse, behind the postero- 
internal angle of the tympanic bone; carotid canal little in advance 
of the foramen lacerum posticum. Tail rudimentary. (Arctoidea 
typica. ) 
URSIDAE., (XVIL) 
2. Last molar of upper jaw more or less transverse and compressed 
forwards; two true molars in lower jaw; first broadest. Foramen 
lacerum posticum antrorse from postero-internal angle of the tympanic 
bone ; carotid canal nearly at or in advance of middle of inner wall 
of the auditory bulla. Tail well developed. (Arctoidea procyoni- 
Sormia. ) 
a. Alisphenoid eanal developed: auditory bulla very small, and with 
a very prolonged bony floor to the auditory meatus: paroccipital 
process long and trigonal, standing backwards and outwards, quite 
unconnected with the bulla. (Flower.)—Teeth 36 (M 3, PM 3,C 4, 
I 2x2). 
AELURIDAE. (XVIII.) 
b. Alisphenoid canal none: auditory bulla well developed, and with 
a short bony floor to the auditory meatus: paroccipital process 
short and blunt, somewhat hooked, generally contiguous to the 
bulla at the base. 
b. 1. Teeth 36 (M 2, PM $,C 4,13 >¢2); last pre-molar of upper 
jaw and first molar of lower tubercular, Snout abbreviated, de- 
curved. Lower jaw very stout, with an extensive anchylosed 
Symphysis, with high coronoid processes, and extended back- 
wards and downwards at the angles. 
CERCOLEPTIDAE. (XIX.) 
b. 2. Teeth 40 (M 2, PM 4, C 4, 1 3x2); last pre-molar of upper 
jaw and first molar of lower tubercular. Lower jaw moderate or 
slender, with a reduced symphysis, with recurved coronoid pro- 
cesses, and extended upwards to the angles, which are near the 
condyles. 
PROCYONIDAE, (XX.) 
