570 PROCEEDINGS OF THE GEOLOGICAL socrnTy, ~~ [June 8, 
straight narrow bone lying with one end in contact with the right 
coracoid, which may perhaps be a clavicle. A somewhat similar 
bone is also in contact with the left coracoid, but in this instance it 
has in some respects the character of a rib. 
The humerus is one inch long, and is a slightly arched stout bone, 
with the extremities a little expanded; the distal end, which is the 
wider of the two, is fully + inch across, while the most constricted 
part of the shaft is a little more than half that width. The propor- 
tional measurements of the humerus in P. Speneri differ considerably 
from the above. In that species this bone has the extremities ex+ 
tremely wide. One figured by von Meyer (tab. ix.), which is 24 inches 
long, has the shaft 3 of an inch thick, while the proximal extremity 
is a little less than 2 inch wide and the distal 2. In P. Hualey 
the proximal extremity i is very little wider than the shaft, and the 
distal extremity is about twice as thick as the shaft. In P. Spenert 
the proximal and the distal extremities are three times the width a 
the shaft. 
The radius and ulna are not by any means slender ; ea are 
about 54, of an inch long, being considerably shorter than the hu- 
merus. The radius is not quite so stout as the ulna, and both 
exhibit a slight sigmoidal curve. The latter is 4, of an inch thick 
at the centre of the shaft, but is a little enlarged at the extremity.’ 
The hand, including the wrist, is a little longer than the lower 
arm. ‘There are two rows of carpals, of which, though disposed in 
nearly regular order, it is not easy to determine the precise numé+ 
‘ber. There seems, however, to be three in the proximal row, and 
four or five in the distal, in all seven or eight. The metacarpals 
are long, being not much short of the length of the toes, of which 
there are five. The number of joints in each will have to be esti- 
mated rather than precisely determined ; for the extremities are con+ 
siderably injured. ‘The first is the shortest, and has apparently two 
phalanges ; the second has three; the third has four, all of which 
are quite distinct; the fourth, which, judging from the size of the 
phalanges, is the longest, has four, but as no trace of the claw is pre+ 
sent, there has no doubt been an additional joint, bringing the num- 
ber up to five, and if so, agreeing in this respect with P: Speneri. ~ 
The left fore limb is almost as perfect as the right, and lies 
stretched out nearly at right angles with the trunk, with the front 
aspect exposed; the back of the right limb is uppermost. The 
proximal end lies upon the coracoid; the distal extremity is sepa- 
rated by a short space from the radius and ulna, both of which are 
-extended in parallel order to unite with the projecting wrist and 
hand. The two latter, however, are so much injured by the accu- 
mulation of galena that the parts are much obscured. 
The chief bones of the left hinder limb, though dislocated, are 
lying close to the pelvic margin in nearly their “Hatural sequence. 
The femur is as stoutly developed as oe humerus ; it is 13 inch 
long, consequently a little more than 2 of an inch larger than the 
upper bone of the anterior limb; it is slightly bent, and has the ex- 
tremities eadaally but not excessively enlarged. The shaft is 4 1 of 
