8 CONTENTS. 



Order of Gasteropoda Cyclobranchiata. Patella Chiton. 



Order of Gasteropoda Inferobranchiata. 



Order of Gasteropoda Tectibranchiata. Pleurobranclms Aplysia Dola- 



bella Bullea Bulla. 



Order of Gasteropoda Nudibranchiata. Eolidia Glaucus. 

 Order of Gasteropoda Heteropoda. Carinaria. 

 Class of Mollusca Pteropoda. Clio borealis. 



LESSON V. 



Class of Mollusca Acephala, or Lamellibranchiata. Organization Classi- 

 fication. 



Family of Ostracea. Classification Oysters Gry phaea Pecten Lima- 

 Malleus Anomia Spondy lus Perna Etheria Avicula Pearls- 

 Pearl Fishery Pinna Area Pectunculus Trigonia. 



Family of Mytilacea. Mussels, (Mytilus) Modiolus Anodonta Unio. 



Family of Chamacea. Tridacna Chama Isocardia. 



LESSON VI. 



Family of Cardiacea. Cardium Donax Cyclas Corbis Tellina Ve 



nus Petricola Venerupis Mactra. 

 Family of Inclusa. Lutraria Mya Byssomia Hiatelia Solen San- 



guinolaria Pholas Teredo Fistulana Gastrochaena ClavigelJa 



Aspergillurn. 

 Class of Mollusca Brachiopoda. General Characters Lingula Terebra- 



tula Orbicula. 

 Class of Mollusca Tun icata, or Acephala Nuda. Biphora Ascidia Botryl- 



lus Pyrosoma Parts of Shells. 



