CONTENTS. 
DISTINGUISHING CHARACTERS OF MoLiuscous ANIMALS,.....- 
CHAPTER I. 
PHYSIOLOGY. 
1, Structure and appendages of the skin. The formation of 
SREUES as atvarcenns dcewiesedncvicuvecs acsiosenceusdhed att Eikeuokp enone 
2. Muscular system. Modes of rest and motion, ........++. vee 
3. Nervous system. The brain. Organs of sense, .........+++ 
4, Digestive system. Phytivorous and carnivorous Mollusca. 
Tentacula. Salivary glands. Stomach and biliary organs, 
5. Circulating system. Lungs. Gills, .. Sai 
6. Peculiar secretions. Colouring Seen " Wiresda “Light 
Air. Pearls, ...... spshiasaneisuieustwceau asks poavansiraeecey? er 
7. Gemerative OFgans,.....cccccccccccccscecceccccccevccncsecencsescccess 
8. Condition of the Mollusca. Residence. TForpidiey Qui- 
escence, Soeeeereseesoee Paosserseceese Oeeseees Poeteeeeeseesererssesesee 
CHAPTER II. 
PROGRESS OF THE SCIENCE. SYSTEMS OF ARRANGEMENT: 
. Systems constructed from circumstances connected with the 
characters of the Shell. Aristotle. Linnzus. Bose. Writ- 
ers On Microscopic Shells, «.......seseseeseveecarsccreresevsees wes 
. Systems constructed from circumstances connected with the 
Habits of the Animal. Lister. Sibbald. D’Argenville. 
Schroter,....... esaesanetVesisceohinwaesie Be Ce ee paspieaas 
. Systems constructed from circumstances connected ‘with the 
Form and Structure of the contained animal. Adanson. 
Miller. Poli. Cuvier,... eeteeceee eeeeerete ereeerre eeeeeeeereeere 
19” 
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33 
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