CONCHOLOGY. 



CONTENTS. 



LESSON I. 



General Considerations. — Mollusca in general — Org-anization — Nervous 

 System — General Form — Skin — Mantle — Shell — Formation of Shell — 

 Digestive iVpparatus — Circulation of the Blood — Respiration — -Senses 

 —Eggs — Classi fication. 



LESSON II. 



Class of Cephalopoda. — General Form — Respiration — Circulation — Organs 

 of Digestion — Cephalic Cartilage — Organs of Locomotion — Organs of 

 the Senses — Nervous System — Habits — Division into tvi^o Families. 



Family of Cephalopoda Dibranchiata. — Octopus Vulgaris, or Poulpe — Argo- 

 naut — Calmaries — Cuttle-fishes. 



Family of Cephalopoda Tetrabranchiata. — Nautilus — Ammonites — Belem 

 nites — Foraminifera. 



LESSON III. 



Class of Gasteropoda. — General Conformation — Classification. 



Order of Gasteropoda Pulmonea. — Organization — Division into two Families, 



Family of Terrestrial Pulmonea. — Limax — Vaginulus — Helix — Bulimus — 



Pupa — Chondrus — Clausilia — Achatina. 

 Family of Aquatic Pulmonea. — Onchidium — Planorbis — Limnasa — Physa— 



Auricula. 

 Order of Gasteropoda Pectinibranchiata. — Organization — Classification. 

 Family of Trochoides. — Trochus — Turbo — Delphinula — Turritella — Cyclo- 



stoma — Valvata — Paludina — Littorina — Monodon — Phasianella — Am- 



pullaria — Janthina — Nerita. 



LESSON IV. 



Family of Buccinoides. — Buccinum — Buccinum properly so called— Harpa 

 — Purpura — Cassis — Cerithium — Murex — -Strombus — Voluta — Ovula 

 Cyprcea — Conus. 



Family of Pectinibranchiata Capuloida. — Pileopsis — Hipponyx — Crepidula 

 — Calyptreea — Siphonaria — Sigaretus. 



Order of Gasteropoda Tubulibranchiata. 



Order of Gasteropoda Scutibranchiata. — Haliotis — Fissurella — Emarginula, 



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