xxtr 



CHAP. III. 



OF FISHES. 



1. The number of fish 256 



2. Their covering ib* 



3. Their brain - ib. 



4. Their organs of sense - - ib. 



5. Gills, or lungs - 38 



6. The heart - 260 



7. The air-bladder - - ib. 



8. The stomach - ib. 



9. The fins - 26.3 

 10. Experiments on fish 263 

 M. Of shellfish - 265 



Of the reproduction of the shells of some fish 266 



Of the extraordinary manner in which lobsters and 



crabs change their shells ib. 

 The remarkable difference of the land crabs on the Ca- 



ribbee Islands - - 270 

 The surprising regularity of their descent from the 



mountains to the sea 271 



Of the soldier crab 272 



Of crabs eyes 273 



Of turbinated fish, of the snail-kind 274 



Of theoyster 276 

 The remarkable movings and operations of the scallop 277 



Of the razor shell - ib. 



Of multivalve shell-fish - 278 



