feMA Afe&^ 



VTTLE-FISHES is the ortho- 

 dox popular name, but as 

 the compound word implies 

 a creature very different 

 from any mollusk, the less it is used the better. At 

 first sight it is difficult to imagine that the re- 

 markable creatures included in the class Cephalopoda 

 have anything but the most remote relationship to 

 the slugs, snails, and bivalves treated in the fore- 

 going chapters. It is by far the most highly 

 organised class of Mollusca, and there does not 

 appear to be any existing forms helping to bridge 

 over the gulf between it and the other classes. 

 As all the British species belong to the order 

 Dibranchia, our remarks will apply only to them 

 as types of the class. Unlike most mollusks they 

 are symmetrical animals, the right and left sides 

 being equally developed. The shell, variously 

 25 



