FIG. 244.—UPPER TEETH OF HORSE, ABOUT FOUR AND ONE-HALF YEARS OLD.

_I^1_, _I^2_, _I^3_, Incisors; _C_, canine; _P^1_, _P^2_, _P^3_,

_P^4_, premolars; _M^1_, _M^2_, _M^3_, molars.