46G BRITISH FOSSIL REPTILES. 



(3') clearly belongs to this ramus, which is fractured beneath its socket. The point of this 

 tooth is broken off: what remains of the body is cnrved, and is implanted more obliquely 

 backward than the two preceding teeth. This at first led me to suspect it might be the 

 foremost tooth of the mandible, and that the left ramus had lieen pushed in advance as well 

 as downward : but my doubts on this point have been set at rest by the specimen (PI. 

 16) next to be described, and I view the tooth in question as the third of the mandibular 

 series : it is divided from the second by an interval of 6 lines, and the second stands at a 

 rather shorter interval behind the first. Five lines behind the third tooth is the base of a 

 fourth laniary (j.'), and four lines further back is an indication of a fifth (s'). This is followed 

 by the characteristic series of between thirty and forty very small, subcompressed cuspidate 

 teeth, each less than a line in length, corresponding in extent with the maxillary part of 

 the upper jaw. The entire series of mandibular teeth occupies an extent of alveolar 

 border measuring 5 inches 1 line. 



The depth of the right ramus gradually increases from 5 lines below the last laniary 

 to 10 lines below the last denticle. The inner side of the dislocated ramus (32') shows a 

 strong longitudinal ridge projecting inwards about 3 lines above the lower border. The 

 outer surface of the ramus seems to have been strengthened near its lower border by a 

 similar but lower ridge. 



The distal ends of the antibrachial bones (54, 55) overlap the hind part of the mandible : 

 that which shows the larger articular surface, op[)osite the three slender metacarpals, 

 should be the radius. The base of the supplementary styloid bone appears near the distal 

 end of the ulna, but is better shown in Buckland's original specimen. Indications of 

 two carpals intervene between these and the metacarpus. This overlies and conceals the 

 articular pedicle of the mandible and contiguous parts (squamosal, malar, &c.) of the 

 skull. The metacarpus includes the three slender supports of digits /,//. »iij ///, and the 

 strong and thick metacarpal of the wing-finger (/,). This bone, being almost con- 

 cealed by the first phalanx in Buckland's specimen, was overlooked, and that phalanx 

 was described as the metacarpal of the wing-finger, Avhich, accordingly, in the restoration, 

 fig. 2, PL 27, of ' Buckland's Memoir,' is made thi-ee times the length of the other and 

 more slender metacarpals (3')- In the original specimen, now in the British Museum, 

 the true metacarpal may be distinctly traced. It corresponds with the same bone in 

 previously described Pterosauria by surpassing in thickness, not in length, the other 

 constituents of the metacarpus. In the specimen, PI. 15, the metacarpal of one 

 wing-finger is clearly shown at ivm. That of the other, lying upon the cranium, is 

 more obscure. The thin compact wall of this pneumatic bone has been crushed in 

 upon the wide air-cavity, as with most of the other long bones, so that it looks like 

 two metacarpals. The proximal articular surface of ^r,« is partly concave and partly 

 convex : the distal articulation is trochlear, moderately concave from side to side at the 

 middle, convex from behiiul forward, with a depression behind, above the ai-ticulation, for 

 securing the olecranoid process of the proximal phalanx. This phalanx (/r, 1), in one 



