HOLLAND: THE OSTEOLOGY OF DIPLODOCUS MARSH 259 
clavicle, this appeared to the writer to be the most plausible, and the models of the 
bones were allowed to remain in this position for a short time. While in this posi- 
tion two photographs were taken, one from directly in front of the skeleton and the 
other at the side. These two photographs are herewith reproduced (Figs. 25 and 
26), and serve to explain what the writer has said in the preceding sentences. 
Against the location of the bones in the position tentatively assigned to them in 
the reproduction is in the first place the fact that the distal extremity of the sup- 
posed clavicle is brought into position behind the sternal plates. Such a location 
is very unusual, though not absolutely without an apparent parallel in other genera 
of the reptilia. In the Plesiosauria, as has been pointed out by Professor H. G. 
Seeley ° and also by Dr. C. W. Andrews,° the clavicles are placed on the dorsal side 
of the scapular girdle. Figs. 27 and 28 represent the position of the clavicles in a 
specimen of Cryptoclidus oxoniensis, which is preserved inthe British Museum. Fig. 
Sia 
—s r 
FZ 
Q 
Gg 
Fic. 27. Superior view of the pectoral girdle of Cryptoclidus oxoniensis. 
Cl., clavicle ; Cor., coracoid ; Sc., scap- 
ula. (Drawn by Miss Alice B. Woodward. ) 
27 furnishes a view from aboye of the clavicles lying in position upon the shallow- 
grooved surfaces in the scapula where they were found im situ when the specimen 
was discovered. I understand from Dr. A. Smith Woodward that there is no doubt 
5‘* The Nature of the Shoulder Girdle and Clavicular Arch in Sauropterygia,’’? by H. G. Seeley, F.R.S. Proceed- 
ings of the Royal Society, Vol. LI., pp. 119-151. 
6 The Pectoral and Pelvie Girdles of Murzenosaurus plicatus,’’ by C. W. Andrews. 
Ann. and Mag. Nat. Hist., 
April, 1895, pp. 429-434. 
