ILLUSTRATIONS. 



Page. 



Plate I. Brachiopoda and Ostreidae 146 



II. Ostreidae 148 



III. Ostreidae 150 



IV. Pectinidae 152 



V. Spondylidae, Aviculidae, and Mytilida* 154- 



VI. Mytilidae and Arcidae 156 



VII. Arcidae, Nuculidae, and Astartidae 158 



VIII. Astartidae and Crassatellidae 160 



IX. Astartidae, Ungulidae, and Chamidae 162 



X. Lucinidae and Cardiidae 164 



XI. Veneridae r 166 



XII. Veneridae 168 



XIII. Veneridae 170 



XIV. Tellinidae and Amphidesmiidae 172 



XV. Mactridae and Corbulidae 174 



XVI. Saxicavidae and Anatinidae 176 



XVII. Muricidae to Buccinidae . 178 



XVIII. Buccinidae 180 



XIX. Buccinidae to Columbellidae 182 



XX. Columbellidae, Cancellariidae, and Terebridte 184 



XXI. Pleurotomidae and Naticidae - 186 



XXII. Naticidae and Calypteridae 188 



XXIII. Tricho tropidae, Scalariidae, and Turritellidae 190 



XXIV. TurritellidaB, Trochidae, Fissurellidae, Acteonellidae, and Crustacaea = Bal- 



anidse 192 



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