228 Mr . Corse's Observations on the 
not adhere to the jaw, but appears in the form of a thin bony 
lamella. 
O. The partition between the second and aftermost grinder. 
P. The opening or communication, in that partition, be- 
tween the second and third grinder. 
Fig. 2. Represents a tooth of the third grinder, consisting 
of eight points at the top, partly covered with enamel. The 
lower part has a puckered or plaited form, probably intended to 
give firmer adhesion to the enamel which is afterwards to 
cover it. 
Fig. 3. Shows a milk grinder worn down to the fangs ; part 
of which, and of the body of the grinder, are absorbed. Where 
the absorption has taken place, the grinders and roots have a 
rough ulcerated appearance. 
Tab. VII. 
Represents the third grinder of the left side of the upper 
jaw, worn away almost to the fangs, even at the posterior part : 
the anterior part completely worn away, and great part of the 
roots and their alveolar processes absorbed. In this grinder, 
the indented puckered form of the enamel is shown, and also 
-its ribbed surface. 
Of the three teeth of the succeeding grinder, which had cut 
the gum, the aftermost tooth shows eight denticuli or points, 
each surrounded with its proper enamel : the next shows five 
denticuli ; but the anterior tooth of this grinder has the centre 
-completely surrounded with enamel. The appearance of this 
grinder is very happily represented ; the posterior teeth nearest 
the gum being covered with a whitish bony crust above the 
-enamel; but, nearer the roots, they are not yet joined together. 
