ANATOMICAL PECULIARITIES OF TRETH. 203 
preserved in the museum of the Royal College of Sur- 
geons, England, and is figured below. In this specimen 
(fig. 109) the lower canines have grown excessively, 
turned backwards, and re-entered the mouth by piercing 
the integument and the jaw. The right tusk has tun- 
nelled the bone for a distance of three inches and re- 
| appeared on the floor of the mouth and has described a 
complete circle. The left tusk, after re-entering the 
FIG. 109.—Abnormal growth of the lower canines of a Boar. 
mouth, seems to have crossed the buccal cavity so that its 
apex rests on the inner side of the right lower jaw. 
This is by no means an unique specimen, for on inquiry 
I have come across numerous examples of this aberrant 
growth of the lower canines of boars. The excellent 
museum of the Veterinary School at Alfort has a speci- 
men resembling that of Cheselden. I have a canine of 
this character from a boar which measures thirty centi- 
