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376 DENTAL ANATOMY

Fig. belong to the upper and two to the lower jaws.
Those of the upper series are supported upon the
palato-quadrate arches and upon a cartilaginous
plate which corresponds in position with the
vomer. Those of the lower series are set upon
M the inner piece of each dentary bone, and be-
come firmly attached thereto by ankylosis.
The two most anterior, and by far the smallest
tr of the upper pairs of teeth, form cutting plates
which resemble somewhat the crown of a broad
inciscH' with the posterior border well rounded
off. They are arranged in the form of a V, with
the point directed forward, having their greatest
extent in an anterio-})osterior direction. After
a considerable interval the two large peculiarly
constructed upper back teeth appear, similarly
placed in the form of a V, and co-ossified
with the bony arches. Their greatest length is
quite equal to one-third the entire length of the
L\\
skull, the breadth being much less. Each of
these dental plates—for such they may be prop-
erly called—has a slightly curved internal bor-
der, Mith the convexity directed inward. The

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Ceralodus : a, a, teeth of same.