914 PRINCIPAL SIR WILLIAM TURNER ON 
breadth. The glenoid cavity was shallow and measured 124 inches in height by 
11 in breadth. The outer surface of the bone was marked by a faint ridge close to 
the anterior border which indicated a rudimentary spine; the acromion, 9} inches 
long, sprang from the bone at the anterior end of this ridge, its surfaces were 
flattened, 5 inches broad, and the free end was truncated (fig. 21). The inner 
surface was flattened. The anterior border was slightly concave, the posterior 
or glenoid border was concavo-convex, and the vertebral border was strongly con- 
vex. The anterior angle was more pointed than the posterior; the bone was 
2} inches thick at these angles, and the vertebral border in places was 2 inches 
thick. The coracoid process was feebly indicated. The scapula has been figured by 
CaPELLINI, Gasco, GRAELLS, HotpER and Trur. In B. mysticetus the coracoid is a 
distinct process. 
Humerus.—Short in relation to its bulk. Head large, articular surface smooth and 
convex, tuberosity large and projecting externally; neck a shallow constriction. The 
bone was one foot 9 inches long, the girth around-the head and tuberosity 3 feet 9 inches. 
The shaft was short and 2 feet 2 inches in girth. ‘The breadth at the lower end was 
one foot 2 inches. The radial and ulnar articular surfaces were distinct and separated 
from each other by a ridge; the radial surface was 8 inches and the ulnar 5 inches wide. 
The epiphyses were fused with the shaft (fig. 22). 
Radius.—A bone with flattened surfaces; the outer border was almost straight, the 
interosseous (inner) border was concave. Its length was one foot 10% inches, its breadth 
at humeral end 10 inches, at carpal end 14 inches, the girth in the middle of the shaft 
was one foot 8 inches. The upper epiphysis was fused with the shaft, the carpal epiphysis 
was ossified and partially fused with the shaft (fig. 22). 
Ulna.—The surfaces of the bone were more flattened in the lower than in the upper 
half, the inner border was markedly concave, the interosseous (outer) border was 
sinuous. The length was one foot 64 inches, the girth in the middle of the shaft was 113 
inches. The humeral articular surface was 54 inches wide, and a short thick olecranon 
process projected at its inner end; the upper epiphysis was fused with the shaft. The 
carpal end was 12 inches wide, and its epiphysis, though ossified, was only partially 
fused with the shaft (fig. 22). In B. mysticetus the olecranon was prominent and 
associated with the humeral articulation, and the bones of the forearm were longer than 
the humerus. 
Manus.—The Hand was pentadactylous and consisted of carpus, metacarpus and 
phalanges (fig. 22). The carpus was for the most part a mass of cartilage about 
2 feet in breadth and one foot in vertical diameter ; its ossification was limited and un- 
symmetrical in the two limbs. In one carpus only two bones were detected, in the other 
only one bone was seen. On the surface of the cartilage indented lines were present 
which mapped it into areas, not at all times distinctly defined. The study of the 
manus was greatly assisted by photographs taken by Mr ArrHur Epwarps after he had 
removed the integument. In the proximal part of the cartilage a distinct area was seen 
