LIASSIC FORMATIONS. 
45 
PI. XVII, 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 
crashed 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 ivm is partly concave and partly 
convex : the distal articulation is trochlear, moderately concave from side to side at the 
middle, convex from behind forward, with a depression behind, above the articulation, for 
securing the olecranoid process of the proximal phalanx. This phalanx i), in one 
wing, is bent back upon the fore-arm, crosses the dislocated mandible, and has been 
pressed upon it, long and hard enough to leave a channel in the right ramus, where part 
of the phalanx has been removed : its length is 4 inches G lines. 
The second, more slender and longer phalanx {xr, 2), is bent at nearly a right angle 
with the first, and lies below and parallel with the mandible ; it is nearly 5 inches in 
length. The third phalanx (/,/ 3 ) is bent upward in front of both lower and upper jaws : 
4^ inches of its length is preserved in the slab : from the analogy of the better pre- 
served specimens (PI. XVIII, xr, about 1 inch 3 lines are wanting from the 
distal end. 
Of the three unguiculate digits the characteristic large claws are preserved : one (//) lies 
above the frontal ( 11 ) with the penultimate phalanx ; the other two are between the upper 
and lower jaws, with some of the slender phalanges : all these parts of the ramus having 
been dislocated and scattered. 
Parts of the distal ends of the radius and ulna (54', 55'), the metacarpal of the 
wing- finger and the proximal end of its first phalanx of the opposite fore- 
limb, occupy a lower corner of the slab : carpal bones, one of the accessory styloid ossicles 
of the forearm, some of the slender metacarpals of the claw-fingers can be made out 
above these : and there are more obscure indications of vertebrae at that end of the slab, 
curvino- toward the cranium. 
O 
All the osseous and dental textures are black, as if charred by slow combustion of the 
animal matter. 
Dimorphodon macronyx. pi. XVIII. 
In August, 1868, I was favoured by the Earl of Enniskillen, then at Lyme Regis, 
Dorsetshire, with a list of parts of a Pterodactyle, in a slab of Lias about 20 inches by 
11 inches, and of other parts in detached portions of Lias, including the entire tail with its 
bone-tendons, which his Lordship had observed at Messrs. James and Llenry Marder’s, 
the judicious and persevering collectors of the fossils of that rich locality. 
The result of this valuable and timely information was the securing for the British 
Museum the entire seiies of these Pterosaurian fossils. 
