i6 



List of Illustrations 



Wavy Venus, exterior 



and interior . .134 



Golden Carpet-shell . 135 

 Banded Carpet-shell . 135 

 Banded Carpet-shell, in- 

 terior . . . .136 

 Pullet Carpet-shell . .136 

 Cross-cut Car^iet-shell . 137 

 Eock Venus . . .137 

 Bock-borer {Pctrlcola 



lithophaga) . . .138 

 Rough Cockle . .140 



Little Cockle . . .140 

 Banded Cockle . .141 

 Common Cockle, interior 141 



Gapers, Piddocks, and 

 Ship-worms „ . 144 

 Blunt Gaper . . .145 

 Hinge - teeth of Psam- 



tnohia . . . .145 

 Tellin-like Sunset-shell . 146 

 Faroe Sunset-shell . .147 

 Hinge and cartilage pro- 

 cess of Gapers . .148 

 Old Maid . . .149 

 Blunt Gaper . . . 150 

 Basket-shell . . .151 

 Interior of Basket-shell, 



showing hinge-teeth . 151 

 Pointed Basket-shell . 151 

 Siphons of Neccra . . 151 

 Oblong Otter-shell . .153 

 Common Otter-shell , 154 

 Short Razor . . .155 

 Smooth Short Razor . 155 

 Egg-shell Razor . . 156 

 Pod Razor . . .157 

 Pod Razor, interior of 



left valve . . . 158 

 Sword Razor . . .160 

 Wrinkled Rock- borer .161 



TAGR 



Wrinkled Rock-borer . 161 



Arctic Rock-borer . .162 



Flask-shell, front view . 162 



Flask-shell, side view . 162 



Flask-shell . . .163 



Case of Flask-shell . . 163 



Pholas in its burrow . 164 

 Right valve of Common 



Piddock . . .165 



Portion of hinge-plate . 165 



Dorsal shields. . .166 

 Common Piddock in its 



cell . . . .166 



AVhite Piddock . . 167 



Little Piddock . . 167 



Paper Piddock . .168 



Wood Piddock . .169 



Ship- worm . . .170 



Norwegian Shij^-worm . 172 



Pandora-shell . . .173 



Left valve of Pandora . 173 



Thin Lantern-shell. . 175 



Papery Lantern-shell . 176 



Tusk-shells,Mail-shells, 

 AND Limpets . .178 

 Elephant's Tusk-shell . 179 

 Grooved Tusk-shell . 180 

 Mail-shells . . .181 

 Under-side of Chiton and 



profile of head . .182 

 Bristly Mail-shell . . 183 

 Bordered ]\Iail-shell . 185 

 Smooth Mail-shell . .185 

 Marbled Mail-shell . 186 



Tortoiseshell limpet . 186 

 Common Limpet . . 188 

 Blue-rayed Limpet . 193 



Blue-rayed Limpet, older 



specimen . . .193 

 Keyhole Limpet . .194 

 Punctured Limpet . .194 



