ON RHAMPHORHYNCHUS BUCKLANDI 149 
British Museum, I have been enabled to inform myself fully as to its 
characters. 
The symphysis of the mandible is broken through, the anterior 
end of the right ramus lying considerably behind that of the other 
branch of the jaw; and the extremities of both rami are broken ; 
hence it is impossible to say in what way they terminated. The 
anterior end of the right ramus, however, exhibits three strong teeth, 
which, where perfect, project rather less than } an inch above the 
alveolar margin, and are separated by intervals of about ths of an 
inch. The anterior of these teeth is recurved ; the second is straight, 
conical, and pointed ; and so much as remains of the third seems to 
show that it had a similar figure. 
Immediately behind the third large tooth commences a series 
of very minute teeth, nearly fifty in number, and occupying a space 
212 inches long. Three-quarters of an inch behind the last, there 
appears to be the remains of another straight lanceolate tooth ; but 
Iam not quite certain that this is the case. Only two of the large 
teeth are visible in the left ramus; and there is no means of telling 
how far the symphysis extended. Behind the second tooth the 
ramus is half an inch deep, and it becomes gradually wider, until 
posteriorly it is three-quarters of an inch deep. Its bony walls 
appear to have been extremely thin and flat; but they are strength- 
ened by a prominent longitudinal shelf-like ridge, which is developed 
from the inner surface of each ramus about a quarter of an inch from 
its inferior edge. 
It is obvious from this brief description, that, notwithstanding 
certain similarities, the mandibles of the Rhamphorhyncht from Sars- 
den and Stonesfield are extremely different from that of Demorphodon 
MACYORYX. 
On the other hand, the proportions of the Stonesfield and Sars- 
den mandibles, the form of their rostrum, and the straightness of 
the only teeth which are preserved, appear, if I may judge from the 
figures and descriptions which have been published by Goldfuss, 
A. Wagner, and Von Meyer, to separate them no less distinctly from 
the other known species of Péerosauria belonging to this division. 
The Pterosaurian remains which were obtained from the Stones- 
field slate many years ago by the late Dr. Buckland, and are now 
leave standing merely because it formed a part of my original communication, and because, 
with Von Meyer, I find three, and not two, long prehensile teeth in the fore part of the right 
ramus of the mandibles. The greater part of the third tooth, however, is broken away 5 
and its stump became clearly visible only upon removing a small portion of the matrix, 
—Dec. 1859. 
