14 
the base; inner lip subspiral, about twenty projecting teeth termi- 
nating outwardly in an even line at the edge of the aperture ; co- 
lumellar sulcus broad and deep, which about eight of the anterior 
teeth traverse and strongly serrate its inner border, no columellar 
groove ; the posterior teeth, proceeding but a little distance within the 
aperture, terminate on the columella; the sulcus being so deep causes 
a rather angular prominence of the inner side of the channel; mar- 
gins thick and round ; extremities, the external posterior broad and 
obtuse, the internal edge-formed concave within ; the anterior project 
moderately and converge; all are dotted with very minute black 
points which extend in a slight degree on to the margins; channels, 
anterior rather narrow and short, posterior moderately wide, both 
inclining towards the columella. 
Length, 125, inch; width, 575, of an inch. 
Hab. ? Cab. Cuming. 
This species is of the stamp of Cyp. Isabella, Linn. 
3. On THE PreERODACTYLES OF THE CHALK FoRMATION. 
By J. S. Bowersank, Esa., F.R.S. ere. 
(Reptilia, Pl. IV.) 
On the 14th May 1845 I exhibited at the Meeting of the Geological 
Society the snout and under jaws, extending from the point to about 
the middle of the cavitas narium, of a new and gigantic species of 
Pterodactylus, with some other bones, a portion of which belonged 
to the same individual, and others which have every appearance of 
having belonged to another animal of the same species *, and I then 
stated my belief that the bone figured by Prof. Owen, in the ‘ Trans- 
actions of the Geological Society,’ vol. v. pl. 39, 2nd Series, would 
probably ultimately prove to be that of a Pterodactyl. From the 
great size of the snout, and the gigantic proportions also indicated by 
the bones accompanying it, I was induced to give it the specific name 
of giganteus. Ona subsequent occasion, June 9, 1847, I continued 
my remarks on these Reptile remains, in a paper entitled “ Microsco- 
pical Observations on the Structure of the Bones of Pterodactylus 
giganteus and other fossil animals,” in which I endeavoured to prove, 
by the strongly-marked peculiarities of the bone-cells in Mammals, 
Birds and Reptiles, that the whole of the bones described in my former 
paper, and those figured by Prof. Owen in the Trans. Geol. Soc., 
2nd Series, vol. vi. pl. 39. figs. 1 & 2, were in truth of purely Repti- 
lian character ; and I also figured a radius and ulna from the Cabinet 
of Mrs. Smith of Tunbridge Wells, of nearly the same gigantic pro- 
portions as the one formerly in the possession of the Earl of Ennis- 
killen, but now in my collection (fig. 1. pl. 39, Geol. Trans.), and a 
bone from the Cabinet of Mr. Toulmin Smith, equivalent to that 
represented by Prof. Owen in the same plate, fig. 2, which bones 
presented the same structural evidence of their Reptilian nature, and 
* Quart. Geol. Journ. vol. ii. p. 7. pl. 1. figs. 1-6. 
