viii ILLUSTRATIONS TO THE SECOND VOLUME. 



FIG. PAGE 



155. Section of Lepas anatifera ..... 215 



156. Development of Balanus balanoides . . . .216 



157. Lepas . ...... 217 



158. Cells of Lepralise . . . . .219 



159. Cellularia ciliata and Bugula avicularia .... 220 



160. Magnified group of Perophora ..... 222 



161. Highly magnified Perophora . . . . . 23 



162. Ascidia virginea ....... 225 



163. Salpa maxima ....... 227 



164. Young of Salpa zonaria ...... 227 



165. Cardium or Cockle . . .... 230 



166. Foot of Cockle . . . . . . .231 



167. Section of shell of Pinna transversely to the direction of its prisms 233 



168. Membranous basis of the shell of the Pinna . . . 233 



1 69. Section of nacreous lining of the shell of Avicula margaritacea 



(pearl oyster) . . . . . . .234 



170. Tongue of Helix aspersa. ..... 237 



171. Palate of Trochus zizyphinus . . . . .237 



172. Granulated Trochus . . . . . .238 



173. Tongue of Limpet ...... 238 



174. Whelk .... ... 240 



175. The Crowned Eolis . . . . . .240 



176. Tongue-teeth of Eolis coronata . . . . .241 



177. Hyalsea and Clio . . . . . .243 



178. Clione borealis .... . 243 



179. Cuttle Fish ....... 245 



180. Arm of Octopus ....... 247 



