CONTENTS. 



LETTER 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 tlie study, 8. 



LETTER IL 



The hurtful Mollusca ; the Teredo, 9—12 : 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 in. 



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

 24.— Mollusca food to quadrupeds, 24—2(5 : to birds, 26—28 : to fishes, 

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

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

 33—35 : the French fislicry, 35, 3G. — Oysters, 36. — Tlie Mussel 

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

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

 Edible Cepha]oi)()ds, 43—45 : Tunicata, 45 : Snails, 45—48. . . 23 



