THE CUTTLE-FISH 73 
Bellerophon dilaiatus (Silurian). 
a 
Pleurotomaria Anglica (Jurassic). Scalaria Gaultina (Cretaceous). 
Aporrhais Sowerbit Voluta Wetherelii Fusus longevus 
(Eocene). (Eocene). (Eocene). 
Fig. 22.—SomEz Fossit GASTEROPODS OR UNIVALVES. 
backwards, and when attacked by an enemy can 
make the water near it cloudy by ejecting a kind 
of ink (sepia); it can escape under cover of the 
10 
