196 OBSERVATIONS ON THE ANATOMY OF 
more than double the length of the two lateral points. 
The first of these grinders is a line and a half distant from 
the second ; the second is half a line distant from the third ; 
and the base of the third is nearly in contact with the 
fourth grinder. The four posterior grinders have very 
broad, and nearly square crowns ; they are in close contact 
with each other, and have each a double row of sharp co- 
nical points; the outer and inner rows being separated 
from each other by a deep longitudinal groove ; the outer 
row consists of three sharp and elevated points, and the 
inner row of two larger tubercles. On each side of the 
lower jaw there are three very sharp incisors^ projecting 
more than a line from their alveoli, and much inclined out- 
wards ; one conical, curved, compressed, canine tooth ; and 
seven molares, the first three of which are compressed, and 
have a single row of cutting points, and the four posterior 
have square crowns and a double row of tubercles, as in 
the molares of the upper jaw. The third incisor from the 
front of the lower jaw is a double tooth, the part above 
the socket appearing like two small incisors united on the 
same neck, and is nearly three lines distant from the canine 
tooth. The canine tooth is rather smaller and more obtuse 
than that of the upper jaw, and is more than two lines dis- 
tant from the first molares. The first three molares are 
shaped like those of the upper jaw, with a long, middle, 
compressed, cutting tubercle, and a smaller cutting point 
before and behind. The first molaris is a line distant from 
the second, the base of the second is nearly in contact with 
the third, and the base of the third is close to the fourth 
grinder. The four posterior grinders are in close contact, 
and have two rows of tubercles separated by a longitudinal 
groove; but, contrary to what takes place in the upper 
jaw, the outer row consists only of two large tubercles, and 
the inner row of three sharp points. The teeth of the 
