CONTENTS. 



LETTER I. 



i 



Conchology a rational study, 1 3 : necessary to the Geologist, 

 3, 4 : important to the Naturalist, 4, 5. Characters of the Mol- 

 lusca, 5, 6 : of Cephalopods, 6 : of Pteropods, 7 : of Gasteropods, 

 7 : of Conchifera, 7 : of Tunicated Mollusca, 7 : of Brachiopods, 

 7 : of Cirrhopods, 7. How to get enthusiasm in the study, 8. 



LETTER II. 



The hurtful Mollusca ; the Teredo, 912 : the Slugs and Snails, 

 12, 13 : monstrous Cephalopods, 13 15: the Aplysia, or Sea-hare, 16 

 18 : poisonous Mollusca, 18, 19 : the Mussel, 20, 21 : Oyster, 21, 22. 9 



LETTER III. 



Edible Mollusca, 23 : dependence of animals on each other, 23, 

 24. Mollusca food to quadrupeds, 24 26 : to birds, 2628 : to fishes, 

 28, 29. Mollusca used for baits, 2931 : food to insects, 31, 32 : 

 food to man, 32. The Oyster, 32, 33. The British Oyster fishery, 

 3335 : the French fishery, 35, 36. Oysters, 36. The Mussel 

 and Cockle, 37, 38 : other edible bivalves, 38 40. Periwinkles and 

 Whelks, 40, 41. Mollusca, their use with savage nations, 42, 43. 

 Edible Cephalopods, 4345 : Tunicata, 45 : Snails, 4548. . . 23 



