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 sHght degree on to the margins ; channels, 

 anterior rather narrow and short, posterior moderately wide, both 

 inclining towards the columella. 



Length, 1^^ inch ; width, .^ of an inch. 



Hab. ? Cab. Cuming. 



This species is of the stamp of Cyp. Isabella, Linn. 



3. On the Pterodactyles of the Chalk Formation. 

 By J. S. BowERBANK, Esa., F.R.S. etc. 



(Reptilia, PI. IV.) 



On the 14th ]\Iay 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 

 Pterodactijlus, 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. pi. 39, 2ud 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 

 oi giganteus. On a 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. pi. 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 Enuis- 

 killen, but now in my collection (fig. 1. pi. 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 ReptiUan nature, and 



* Quart. Geol. Journ. vol. ii. p. 7. pi. 1. figs. 1-6. 



