Fic. 9. 
ices, lop 
Fic. 9. Imperfect Skull of an Extinct Sperm-Whale (Balzenodon patagonicus), 
from the Middle Tertiary deposits of Patagonia. About jt, natural 
size. 
Fig. 10. Skull, without lower jaw, of an old male Bottle-nosed Whale 
(Hyperoidon rostratus), About ~; natural size. 
[To face page 24. 
