432 Mr. C. W. Andrews on the Pectoral and 
projecting processes as in the fully ossified coracoid of Crypto- 
clidus. The thin inner posterior portion of the bone is 
frequently broken away, and the remaining portion, consisting 
of the thickened anterior and external borders, has then the 
form shown by Prof. Sceley in his figure of the coracoids of 
Murenosaurus Manselli *. 
The posterior convex margin in the present specimen bears 
rough grooved surface for cartilage, showing that growth 
was still in progress in this direction, Anteriorly the cora- 
coids are prolonged forwards in the middle line in short 
pointed processes, which extend towards the backward processes 
of the scapule, but do not reach them ; both bones, however, 
bear surfaces for cartilage, and were probably already united 
by a bar of that substance. 
The dimensions of the pectoral girdle are :— 
centim. 
Extreme length from anterior end of scapulze to hinder 
border Of COracolas: - 0.1%. \o5.9% oo hese 59 
Width across coracoids in a straight line between the 
hinder edges of the glenoid facets.............. 38 
xtreme length. of corngoids | is.).46 cc ce ohh eens 40 
Width of coracoids at narrowest point.............. 27 
The humerus (A) figured measures about 31 centim. long ; 
the smallest circumference of its shaft is 21 centim., and the 
width of its expanded distal extremity is 19 centim. 
The Pelvic Girdle. (Figs. 2, 3.) 
The pelvis represented in figs. 2 and 3 gives a clearer idea 
of the structure of that portion of the Plesiosaurian skeleton 
than any other specimen or figure with which I am acquainted. 
The pubis (pu) is a broad nearly flat plate of bone, very thin 
except near the median border and the articular surfaces for 
the ischium and femur; the posterior margin is also some- 
what thickened. The width of the bone from the antero- 
external to the antero-internal angle is 28 centim., the length 
from the ischial surface to the anterior border 25°5 centim. 
The length of the acetabular surface is about 8 and of the 
ischial surface 4centim. In the specimen figured the left pubis 
has been restored in plaster. ‘The two pubes seem to have 
made an angle of about 120° with one another; they were still 
separated in the middle line by a pad of cartilage, which was 
widest in front and behind ; whether the posterior portion of 
this cartilage extended back to join, that lying between the 
* Quart. Journ. Geol. Soc. vol. xxx. (1874) p. 487, fig. 2. 
