BY C. W. DE VIS, M.A. 187 
between the third and fourth is a large and deep pit and, in the 
same relation to the fourth and fifth, another shallower, 
while at a corresponding distance from the edge of the notch is 
a still smaller but better defined one; these cavities may 
perhaps be due to the action of the mandibular teeth. 
PORTION OF HINDER PART OF MAXILLARY. 
Prave! Xe, Wie. 2: 
We have in this well-worn fragment further evidence almost 
of itself sufficient to convince us that the fossil reptile was, in 
the broad sense, an alligator. Within and between the stumps of 
the three broken teeth are three well-marked pits for the recep- 
tion of the hinder mandibular teeth. Those of the crocodilide 
pass not inside of, but between the teeth of the upper jaw. 
LEFT MALAR, Anpvtrt. 
PEATE, LV .,- Fig... 
The characteristic features here are—first, the flattening and 
extension of the inferior edge inwards at right angles to the 
lateral surface, the expansion forming a triangular area with 
its apex entering the junction of the maxillary and 
-ectopterygoid sutures. The pitting of the facial surface is con- 
tinued over the greater part of this area. Second, the presence 
of a deep suborbital groove commencing superficially opposite the 
post-orbital process and dividing the broad and boldly sculp- 
tured edge of the orbit from the rest of the bone. In the 
massively angular character of the skull and mandible suggested 
by this bone and by the surangular element, we have a further 
reminder of its condition in the caiman. 
PREFRONTAL REGION. 
Pirate XIV.—Fie. 2. 
In the adolescent stage exemplified by this fragment, the 
interorbital space is quite flat and devoid of transverse ridge. 
At about the middle of the anterior half of the edge of the 
orbit a broad groove commences on each side and diverging 
