CETOTOLITES. 533 
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Why Wy” Z 
a 
Tympanic bone of Balana emarginata, 2 nat. size, Felixstow. 
There is a fourth form (fig. 224), which differs from the 
last in the less degree of convexity of the involuted part, 
but more particularly in its outer border being notched or 
indented, as in Balena mysticetus, by a vertical angular 
impression deeper and wider than the smaller vertical 
fissures. 
The comparative shortness of the involuted convexity 
distinguishes this species from the existing Balene and the 
Bal. affinis, the notched and less convex involution from 
Bal. gibbosa, and the immediate rising of the overarching 
Fig. 225s 
ib 
“ally Mh a 
me 
: : a i 
i | a / 
Tympanic bone of the recent Cachalot, 5 nat. size, 
