154 ON RHAMPHORHYNCHUS BUCKLANDI 
ascertained, as this part of the bone is partially crushed by the 
superjacent radius and ulna. The total length of the scapula is 
rather more than two inches. 
From the close similarity in form and proportions between so 
much of the coraco-scapular arch of the Stonesfield specimen as is 
preserved and the corresponding parts of the same apparatus in 
Dimorphodon macronyx, there can be little doubt that it ‘is tolerably 
safe to complete the outlines of the former in accordance with the in- 
dications given by the latter, the sternal end of whose coracoid must 
therefore have measured {ths of an inch in width, while its scapula 
must have been more than four inches long. 
The coraco-scapular bone in the Oxford Museum, to which I have 
referred above, is hardly more than half as large as that represented 
in fig. 4. It is exposed from its inner side ; and the short and rounded 
anterior coracoid process is well displayed. The plane of the scapula 
is inclined at nearly 45° to a vertical plane traversing the longi- 
tudinal axis of both bones. The bone itself is thicker in the middle 
than at the edges, which are sharp; and it is considerably expanded 
from before backwards below, where it unites with the coracoid. 
The internal face of the latter bone is flattened and slightly concave 
from above downwards anteriorly ; but posteriorly, or inferiorly, it 
presents a thick edge, convex from above downwards, and slightly 
concave from before backwards. 
A specimen from the Stonesfield slate, for which I am indebted 
to Dr. Wright, exhibits a left coracoid with a small portion of the 
scapula, from the inner side (fig. 5, Pl. XXIV. [Plate 10]). It shows 
the coraco-scapular suture and the thick inner edge of the coracoid 
very well. The extreme end of the coracoid is absent; but what 
remains of this bone is three inches in length, so that it can have 
been but little inferior in size to the largest described above. 
There are in Dr. Wright’s Collection some incomplete bones which 
appear to be portions of humeri; and he has one very fine and nearly 
perfect metacarpal of the long finger of the left fore-limb. This 
bone (Pl. XXIV. [Plate 10] fig. 8) is fully two inches long. Its 
trochlear distal extremity, which is somewhat bent downwards, is 
half an inch wide, and is divided by a deep excavation or groove 
into two portions, of which the inner is rather the larger. This 
groove is continued a little way backwards on the dorsal surface of 
the shaft of the bone, which is flattened, and about ,*,ths of an inch 
wide by tinch thick. Posteriorly, or proximally, the bone rather 
suddenly widens to ,%ths of an inch; and the wide surface exhibits 
the commencement of the two grooves separated by a ridge, which are 
