114 Mr. E. D. Cope on the Systematic Relations 
External nostril occupied by the complex maxillotur- 
binal bone; ethmoturbinals confined to the pos- 
terior part of the nasal fossa; the inferior ethmo- 
funbinalvof reducedistzeiemenie eae eee ation HypomyctTeErRI. 
External nostril occupied by the inferior ethmoturbinal 
and the reduced maxilloturbinal .............. EPIMycTeERI. 
While no doubt transitional forms will be discovered, the 
types at present known fall very distinctly into one or the 
other of these divisions. The characters are readily per- 
ceived on looking into the nares of well-cleaned specimens. 
The Hypomycteri stand next to the Pinnipedia, since the 
maxilloturbinal bone has the same anterior development in 
that group. 
In searching for definitions of the families it is necessary to 
be precise as to the definition of terms. ‘The meaning of the 
word sectorial is in this connexion important, since there are 
so many transitional forms between the sectorial and tuber- 
cular tooth. <A sectorial tooth then of the upper jaw is one 
which has at least two external tubercles, which are the 
homologues of the median and posterior lobes of the sectorial 
of the cat. By the flattening and emargination of their con- 
tinuous edges the sectorial blade is formed. One or two 
interior and an anterior lobe may or may not exist. In the 
genera of the Procyonide, except in Bassaris, the two exter- 
nal tubercles do not forma blade. The inferior sectorial tooth 
differs from the tubercular only in having an anterior lobe or 
cusp, which belongs primitively to the interior side. The 
inferior sectorial teeth with large heels, as in Viverride and 
Canide, I have called tubercular sectorials. The sectorial 
blade is formed by the union and emargination of the edges 
of the anterior and the principal external cusp. This blade 
is not well developed in the genus Cynogale, and still less in 
the Procyonide and Urside. The families are then defined 
as follows :— 
HyPoMYCcTERI. 
I. No sectorial teeth in either jaw. 
PIQESIOILO Gs an oe eichvtia Siam sse deity 6 ia ASAP claea a eats Cercoleptide. 
II. Sectorial teeth in both jaws. 
a. Toes 5. 5, 
B. No alisphenoid canal. 
(Dane) NG ENG) Se Ree Aogac coo unieage con pando o- Procyonide. 
ss PMS Mie a crc toie ie ayeaie sien’ d biote %,5 feet aiat ae cane Mustelide. 
88. An alisphenoid canal. 
Molaratquadratiesi2) iis cds is eh ste eihold chat oes othe Aluride. 
Molars)lonoutudinals 22 25 des0 «sing mies ech ernie herders Urside. 
aa. Toes 5.4 0r4.4 
Sectorials well developed, an alisphenoid canal ...... Camde. 
