LIST OF ILLUSTRATIONS. XV 



PAGE 



55. The Branchial Lungs of Ampullaria 191 



56. Geearcinug rusticula, a Land Crab 192 



57. a, Lvpca. ; b, Ocypoda 196 



58. Univalves that cling to Rocks by means of the Foot . . 203 



59. Various Animals that swim by means of Fins . . . 206 



60. Creeping Mollusca 208 



61. Diagram of Section through Neritina and Navicella, showing 



the position of the Operculum . . . . .211 

 ^tion of the Shell of Unio (a Fresh-water Mussel) . . 213 



63. Shells with living Animals, but injured by Erosion . . 214 



64. The Inhabitants of Coral Galls 217 



65. Seriatopora hystrix, with Galls inhabited by Hapalocarcinus 



margupialis 218 



66. A Gall on Seriatopora fiyrtrif, opened . .... 219 



67. Sideropora palmata, with a Gall or Cyst .... 220 



68. Goniastraa Bonrnoni, M. Edw., with a Funnel in which lives 



a CryptocMrus coralliodytet, Hiller 222 



69. Diagram of the Growth of a Colony of Porites . . . 225 



70. a, Section through Kriangle ; b, through Babetthuap at 



Aibukit ; c, through Pclch-n- 258 



71. Pyrosoma gigas . . . . . . . .271* 



72. Onchidium tongamim, nat. size ....... 281 



73. The Shells of Philippine Snails 284 



74. Avykidtvwtmt maculiferus, Sow. 285 



75. Troeomorplia sp 288 



76. Temnocepliala chih'iixix, Blanchard 293 



77. Two operculated Fresh-water Snails 299 



78. Various Fresh-water Univalves 300 



79. a, an Amoeba in a Locomotive State : b, the same, encysted . 302 



80. Cypris sp. from the Philippines . . . ... 304 



81. Trocliosplifpra tequatorialis, from the Philippines . . . 306 

 M'. Coregonn* Memalis 321 



83. A piece of Wood bored by Limnoriit ten-brans, from Heligo- 



land 326 



84. A piece of solid Limestone, similarly bored, from Ireland . 326 



85. Part of a Stock of Campannlaria, a Hydroid Polyp, with 



closed pear-shaped Galls, containing a Sea-Spider, Pyc- 



Jiogonida ......... 332 



86. Hete?vj)*annnia Michcliid 335 



87. Hetereeyftktu ftiUfpeiuu 336 



88. BhizocMlus antipathnm, Steenstrup 337 



89. A Specimen of Carcinus m&nas, from Heligoland, with three 



Individuals of the Parasitic Sacciiliua carrini . . 340 



90. Antipatlie* lilix, Pourtales 341 



