ILLUSTRATIONS. 



I. Briuliiopoila aud OstreiiUe 146 



II. Ostreitluj 1^1^ 



III. Ostreidio 150 



IV. Pectiuidiu 152 



V. Spoudylida*, Aviculid*, ami Mytilida' 154 



VI. Mytilidu: and Arcidw 156 



VII. Arcidai, Nuculida), and Astartida' 158 



VIII. Astaitidie aud Crassatellidse 160 



IX. Astartida', Ungulidie, and Chamida- 162 



X. Lucinidai and Cardiida- 164 



XI. Venerida! 166 



.\II. Veneridai , 168 



XIII. Venerid* 170 



XIV. Telliuida; aud Amphidesniiidas 172 



XV. Mactiidje and Corlmlidai 174 



XVI. Saxicavidse and AnatiuidiB 176 



XVII. MuricidiB to Bucexnidie 178 



XVIII. Buccinida; 180 



XIX. Buccinidie to C'olumbellid;p 182 



XX. Colunibellida>, Cancellariida-, and Terebrida- 184 



XXI. Pleurotoniida? and N'aticid;e 186 



XXII. Naticida^ and CalypteridiD 188 



XXIII. TrichotiopidiB, Scalariidie, and Turritellida? 190 



XXIV. Turritellidte, Trochidaj, Fissurellidse, Acteondlida-, aud Ciustaca>a = Bal- 



auids 192 



7 



