46 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. | Nov. 24, 
Figures of these teeth, of the natural size, are given in plate 
62 A, figs. 4a & b, of the work cited. 
I am at a loss to discover the smallest resemblance between these 
teeth and either those of Thecodontosaurus of Riley and Stutchbury 
or the so-called “‘ Palewosaurus” platyodon tooth, which is repre- 
sented in the same plate, fig. 7; nor can I divine in what sense the 
Cladyodon teeth can be said to be intermediate between the two. If 
they were affirmed to be intermediate between Thecodontosaurus and 
Paleosaurus cylindrodon, the statement would be intelligible, though 
I do not think it would be altogether accurate. 
I have been favoured by Mr. T. G. B. Lloyd, F.G.S., with the 
opportunity of examining three Saurian teeth from the quarries which 
yielded Cladyodon. Two ofthese teeth (Pl. III. fig. 4) are so similar 
to those of Paleosaurus cylindrodon in form, and even in colour, that 
I conceive them to belong to the same genus, and perhaps to the same 
species, although they are twice as large as the teeth from Bristol. 
They show most distinctly the abrupt cessation of the anterior ser- 
rated ridge about halfway down the crown, which beneath this point 
is rounded and curved as in Megalosaurus. I see no reason to doubt 
that these are Dinosaurian teeth. Of the other tooth, only the 
crown, which is 1°8 inch long, is preserved (Pl. III. fig.11). This 
tooth must have had, as nearly as may be, the same dimensions as the 
hindmost tooth in the upper jaw of the Megalosaurus figured in the 
‘Quarterly Journal’ of this Society (vol. xxv. pl. 12); and if placed 
over that tooth it corresponds with it in contour with remarkable 
closeness. On the whole, however, the crown of the Megalosaurian 
tooth is thicker near the fang than the present tooth. But what 
distinguishes the latter at once from all the Megalosaurian teeth of 
which I have been able to obtain a sufficiently clear view, is the fact 
that the serrated anterior ridge extends along the whole length of 
the crown, instead of stopping short halfway from the apex, as it 
does in Megalosaurus. In this respect the tooth from the Trias re- 
sembles those of Teratosawrus; and it may possibly belong to that 
enus. : 
5 Thus it appears that there are two kinds of Dinosaurian teeth in 
the Warwickshire Trias—one kind allied to Afegalosaurus, the other 
to Thecodontosaurus. 
Thanks to Mr. Kirshaw, who has so skilfully worked out many 
of the fossils of the Warwickshire Trias, I am able to add new evi- 
dence which tends in the same direction. This consists of three 
consecutive vertebree (Pl. III. fig. 9), which have been ankylosed 
together, though they are now separated by the breaking away of the 
greater part of the hinder portion of the second vertebra. The centra 
of these vertebrae are much constricted in the middle, while their arti- 
cular surfaces are flat or slightly excavated (PI. III. fig.10). The 
bones have been so much distorted and crushed that it is hard to say 
what the contour of these surfaces may have been; but they were 
either circular or oval, the long axis of the ellipse being vertical. The 
spinous processes are broken away. The faces of the preezygapophyses 
look inwards as well as upwards, so as to embrace the postzygapo- 
