406 MR.W. H. FLOWER ON THE SKELETONS OF WHALES [Nov. 8, 
49", and the fourteenth 48". They gradually decrease in breadth 
from the first. The last is considerably twisted on itself; it has a 
small, flat articular head, but there is no corresponding surface on 
the fourteenth dorsal vertebra, which is only slightly thicker at the 
extremity than the succeeding ones. On the thirteenth vertebra 
there is a distinct articular surface. 
The sternum (fig. 8) is small, in the form of an irregular trans- 
versely elongated lozenge, the posterior angle being narrower and 
more produced, and the anterior more rounded, than in the Zuyder 
Zee specimen ; so that it approaches more the form seen in the genus 
Physalus. Its length is 8%”, and its breadth 122". 
The scapula is low and broad, with a long acromium and well- 
developed coracoid process. Its breadth is 40", its height 222"; 
the acromium 10" long, and 3! in depth; the coracoid 4"; the gle- 
noid fossa 83! by 54!.. The humerus is 15! long, by 6! in diameter 
in the middle of its shaft and 73" at the lower end. The radius is 
243" long in a straight line, 4!'"6 broad above, 3-7 at the middle, 
and 5''"3 at the lower end. The ulna, which is 25" long, including 
the olecranon projection, is 7'"5 broad above, 2!'*7 at the middle, and 
4"-5 at the lower end. The thickness of the radius at the middle is 
2-9, that of the ulna 1/8. 
Fig. 16. Tympanic bone; half nat. size. 
17. One of the stylo-hyals. 
The hyoid bone, formed of the completely united basi- and thyro- 
hyals, is flatter and deeper from before backwards, and the lateral pro- 
cesses are smaller and more tapering, than in Physalus; but otherwise 
its general form is not dissimilar. Its extreme width in a straight 
line is 25'; its antero-posterior length 103. The stylo-hyals 
(fig. 17) present a remarkable modification in form. Instead of the 
usual subeylindrical shape seen in Physalus and Balenoptera, they 
are very broad and flat, and much curved, having a convex rounded 
