14 



List of Illustrations 



TEXT ENGRAVINGS 



Feeding and Breathing 40 



Beak of a Cuttle - fish 

 (Sejna) . . .41 



Portions of the tongue of 

 a Whelk, with a row 

 of teeth ... 42 



Teeth of raduhe of Lim- 

 nwa stagnalis, Ancylus 

 JlaviatUls, and Succin ca 

 putr'is . . . .43 



Under surface of Limpet 45 



Seeing, Hearing, and 

 Smelling . . .48 



Nut-shells and Mussels 54 

 Common Nut-shell . 55 



Interior of Nut-shell . oo 



Hinge-teeth . 



Sliining Nut-shell . 



Beaked Leda . 



Dwarf Leda . 



Interior of Beaked Leda- 

 shell . . . . 



Saddle-oyster, under-side 



Side view of Saddle- 

 oyster, showing mode 

 of attachment 



Bight side of Anouila, 

 with shell removed 



Prickly variety of the 

 Saddle-oyster 



Noalrs Ark . 



Milky Ark, interior 



Connnon Mussel (il/j/^i7«6' 

 cdulis), closed and 

 attached by the byssus 



Common Mussel, opened 

 to show the various 



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