27G 
PROFESSOR H. G. SEELEY ON THE STRUCTURE, ORGAHIZATIOX, 
to be a longitudinally oblong bone 12 millims. long, with the anterior border probably 
straight and transverse, probably parallel to the transverse straight suture by which 
it unites with the coracoid. The internal margin was probably straight, as it appears 
to be in the specimen as exposed, but it is not quite free from matrix. Thus, there 
would be three straight sides of the oblong meeting each other at right angles. 
The width of the bone in the middle is not less than the length ; but the external 
border is notched, not unlike the external border of the coracoid in many Lizards. 
In the middle of the side there is a strong short process directed outward and back¬ 
ward towards the articulation, into which it may possibly entei\ Anterior to this 
process the bone is concavely excavated on the margin by a notch which extends to 
its anterior angle. Posterior to tliis j^rocess is an oval foramen or notch obliquely 
placed, which extends towards the posterior angle near the suture with the coracoid, 
and appears to be homologous with the coracoid foramen in Dinosaurs and other 
Reptiles, which may thus become a pre-acetabular notchi 
The coracoid is about P4 centim. long, and as wide as the pre-coracoid. Its inner 
side is straight, and its posterior end convexly rounded from within outward. The 
external border consists of two nearly equal yrirts ; a thickened anterior articular 
surface which forms part of the glenoid cavity for the humerits, which looks outward 
and a little forward; and, secondly, a posterior concave area which contracts the 
width of the bone, but sends a small process outward and upw^ard like that seen at 
the posterior margin of the bone in some Plesiosaurs. The length of the articulation 
as formed by the pre-coracoid and coracoid is about P4 centim. 
No evidence of a scapula is seen ; and the clavicle is imperfect and only seen on the 
left side, where it extends, if correctly determined, backward and upward from the 
outer angle of the transverse bar of the inter-clavicle as a thin flat plate of bone 
1‘6 centim. long, and narrowing from 4 to 2 millims. 
Posterior to the shoulder-girdle are some indications of ribs on the right side. 
They were sub-cylindrical and hollow. There are much smaller sternal ribs, but their 
relation to the ribs is not clear. 
The Fore-limi ).—Both humeri remain in natural contact wdth the bones of the 
shoulder girdle. The distal ends are missing on both sides. The bone may have been 
3'5 centims. long. The proximal end was expanded, with a rounded condyle. The 
inferior surface was concave transversely, and slightly convex in length. Tlie radial 
crest did not reach to the proximal end ; it was of moderate length, and reflected 
downward. The ulnar tuberosity was extended backward; it appears to have been 
quite as large as the radial crest. The transverse width over these proximal processes, 
as preserved, is 1'6 centim. The diameter of the middle of the shaft hardly exceeds 
3 millims. 
The radius is a slender bone, 2‘3 centims. in length. Its shaft is slightly twisted, 
a little convexly bent outward, with the ends moderately enlarged, and their articular 
surfaces convex. 
