in the Neighbourhood of Edinburgh. 193 
resemblance to those of the Gavial of the Ganges. (See Plate 
VIII. fig. 1.) Nor did the internal structure of such teeth as were 
discovered forbid the supposition. ‘This is shewn in the annexed 
figure, which represents the section of a tooth, which had been 
found broken longitudinally :—a repre- 
sents a lower and outer portion of the 
tooth, while 0 is its reverse side, in 
which an internal cavity is observable, 
at present filled up with earthy sub- 
stance, not unlike the cavity observa- 
ble in the teeth of large reptiles, which is supplied with a re- 
placing tooth. 
The larger longitudinal fragment of the same tooth is repre- 
sented by c, in which the counterpart of the same internal cavity 
is discernible. 
It is true that this internal structure was not a decisive mark 
of the animal having been a reptile, yet, when the immense size 
of some of the teeth subsequently discovered was also taken into 
consideration (see Plate IX.), one of which was 33 inches in 
length, and when no extinct animal coeval with or earlier than 
the new red sandstone formation had been hitherto recorded as 
possessing such immense teeth, saurian reptiles alone excepted, 
the reference of the teeth to such animals was, at least, the most 
ready supposition, and justifiable. 
In the second place, various scales were collected. These 
were of two kinds. 
The first of these comprised the remarkable structures which 
are represented in Plate VIII. fig. 2. It is not the first time 
that these scales have been discovered in coal-fields. They have 
even been figured as fungi belonging to the vegetable world. In 
the present instance, it may be supposed that these substances. 
had, in the limestone, met with a better state of preservation, as 
it was impossible not to be struck with their internal cancellated 
structure, which forbad any supposition but that they were osse- 
VOL. XIII. PART I. Bb 
