42 
FOSSIL REPTILIA OF THE 
vertebral column, of the species which he called Pterodactylus macronyx — the first 
evidence of the genus from deposits so low, or ancient, in tlie Oolitic series. 
In 1858 I obtained the skull, with a few other parts of the skeleton of the same or a 
closely allied species, from the Lower Lias at Lyme Regis, and communicated a brief 
notice of it to the British Association, which that year met at Leeds.^ 
This specimen confirmed the accuracy of Buckland’s conjecture, which I had doubted, 
viz., that the portion of lower jaw with the series of small lancet-shaped, close-set teeth,® 
in a second slab of Lias, belonged to the same Pterodactyle as the limb-bones he described ; 
but it also showed that these teeth, so like those of some Fishes, were limited to the lower 
jaw, and were associated, in the same mouth, with long, slender, trenchant and sharp- 
pointed laniaries, projecting with wide intervals, and set in advance ; which kind of teeth 
had, hitherto, alone been found in the different species of flying Reptiles. 
The chief result of the study of the second discovery of a Pterosaurian in Lias, viz., 
its evidence of a new generic form {Dirnor2:)hodon) in the order of volant Heptilia, in 
addition to RampjhorhyncJms, von Meyer, and Pterodacfylus proper, was noted in the com- 
munication above cited. 
The third specimen about to be deseribed confirms that taxonomic deduction, showing 
a combination of the caudal character, mainly differentiating RampJiorhyncJms from 
Pterodactylus, with the dental character above defined. 
I propose first to describe and figure the two specimens yielding the cranial and 
dental characters of Pimoiphodon, and then to attempt a restoration of the Liassic species, 
D. macronyx. 
The first specimen with the skull is figured in PI. XVII. It is on a slab of Lias, mea- 
suring II inches by 7 inches. The right side of the head is exposed F it has been subject 
to pressure and some degree of dislocation. Certain bones of both wings, and a few 
other parts of the skeleton are preserved, pell-mell, in this slab, pressed amongst 
and upon the bones of the head, especially at the back part of the skull. 
The right premaxillary (22), maxillary (21), and nasal (15), are almost in their natural 
positions, give the profile contour of that part of the skull, show most of the teeth of the 
right side upper jaw, and reveal the singular expansion of the nasal {n) and antorbilal (a) 
vacuities. The alveolar part of the left maxillary (s'), with its ascending postnarial 
branch has been pushed obliquely downward, with fracture, but without much 
displacement, of the beginning of the alveolar ray, the inner surface of which is 
exposed. 
The mandible (32) has been dislocated and pushed below the place of its articulation 
with the tympanic (28) : the left ramus has also been subject to the same force which has 
^ “On a New Genus {DimorpJiodon') of Pterosauria, with Remarks on the Geological Distribution of 
Flying Reptiles in ‘Reports (Sections) of the British Association,’ 1858, p. 97. 
2 Buckland, loc. cit., pi. xxvii, fig. 3. 
® The specimen has been drawn, in PI. XVII, without reversing. 
