LIST OF ILLUSTRATIONS XT 



FIO PAGE 



155. UNDEB SIDE OP THE SHELL op Natica catena, SHOWING THE 



UMBILICUS ; AND OUTLINE OP THE SHELL, SHOWING THE 



EIGHT-HANDED SPIRAL ...... 225 



156. SECTION OP THE SHELL OP THE WHELK, SHOWING THE COLUMELLA 226 



157. DlAGBAM OF THE ANATOMY OP THE WHELK, THE SHELL BEING 



BEHOVED ........ 228 



158. A POBTION OP THE LlNGUAL RlBBON OF THE WHELK, MAGNIFIED J 



AND A SINGLE BOW OF TEETH ON A MUCH LABGEB SCALE . . 229 



159. EGG CASES OF THE WHELK ...... 230 



160. PTEBOPODS . . . . . . . . 231 



161. NUDIBBANCHS ..... . 234 



162. .... ... 235 



163. SHELLS OF TECTIBBANCHS ...... 236 



164. CHITON SHELLS ........ 238 



165. SHELLS OF Dentalium ...... 238 



166. Patellidas . . . . . . . . . 239 



167. Calyptrcea sinensis ....... 241 



168. Fissurellidce . . . . . . . . 241 



169. Haliotis ......... 242 



170. lanthina fragilis . . . . . . . 242 



171. Trochus zizyphinut. 2. UNDEB SIDE op SHELL. 3. Trochus 



magnus. 4. Adeorbis subcarinatus .... 244 



172. Missoa labiosa AND Lacuna pallidula . . . 244 



173. SECTION OF SHELL OP Turritella ..... 245 



174. Turritella communis AND Ccecu/m trachea . . . . 245 



175. Cerithium reticulatum AND Aporrhais pes-pelicani . , 245 



176. Aporrhais pes-pelicani, SHOWING BOTH SHELL AND ANIMAL . . 246 



177. 1. Odostomia plicata. 2. Eulima polita. 8. Aclis tupranitiJa- 246 



178. Cypreea (Trivia) europcea . . . . . . 247 



179. 1. Ovulum patulum. 2. Erato Itzvis .... 248 



180. Mangelia septangularis AND Mangelia turricula . . . 248 



181. 1. Purpura lapillus. 2. EGG CASES OF Purpnra. 3. Nassa 



reticulata ........ 249 



182. Murex erinacens ....... 249 



183. OCTOPUS ......... 251 



184. Loligo vulgaris AND ITS PEN . . . . . 252 



185. Sepiola atlantica . ..... 252 



186. Sepia ojficinalis AND ITS ' BONE ' . . . . . 253 

 187 EGGS OF Sepia ........ 254 



188. THE NEBVE-CHAIN OF AN ABTHBOPOD (LOBSTKB) . . . 257 



189. SECTION THBOUGH THE COMPOUND EYE OP AN ABTHROPOD . 260 



190. FOUB STAGES IN THE DEVELOPMENT OF THK COMMON SHOBE 



CBAB ...... . . 261 



191. THE BABNACLE ........ 261 



192. FOUB STAGES IN THE DEVELOPMENT OF THE ACORN BABNACLK . 262 



193. A CLUSTEB OF ACOBN SHELLS ... . . 263 



