110 ELEMENTS OF MAMMALIAN ANATOMY. 
central cusp, posterior to which is the large triticone. At 
the medial anterior angle is the deuterocone. The small 
projection at the lateral anterior angle is the protostyle. 
Fic. 58. Laterat Aspect OF THE PERMANENT DENTITION OF THE Cat. 
is, 2, 13, First, second, and third incisors of the upper jaw; c, canine; fu, 
ps, and ps, first, second, and third premolars; m, molar; 1, 2, 3, the 
incisors of the lower jaw; 4, canine; 5 and 6 first and second pre- 
molars; 7, molar; c, cingulum; d, deuterocone; m, metaconid; m, 
molar; pt, protoconid; rc, protocone; td, talonid; ¢, talon; tr, 
triticone. 
The root of the tooth usually consists of three fangs. The 
posterior tooth in the maxilla is called the molar, since it is 
the only one not preceded by a milk tooth. It is very small 
and its crown presents a grinding surface instead of a 
cutting one. Its root consists of two fangs. 
Each half of the mandible holds three incisors, one 
canine, two premolars, and one molar. The incisors and 
canine are so similar to the upper ones that they need no 
further description. The first premolar presents a princi- 
pal cusp or protoconid, a lower small cusp or metaconid, 
and a projection, on the posterior side of the base, known 
as the talonid. A cingulum or encircling ridge is also pres- 
ent at the base of the tooth. The root consists of two 
fangs. 
The second premolar is very similar to the first except 
