97. _Sagartia nivea,_ DEVON AND CORNWALL 147 98. _Corynactus viridis,_ DEVON AND CORNWALL 148 99. _Bunodes thallia,_ WEST COAST 150 100. _Bunodes gemmacea,_ WITH TENTACLES RETRACTED 151 101. _Caryophyllia cyathus_ 152 102. _Sagartia parasitica_ 153 103. THE CLOAK ANEMONE (_Adamsia palliata_) ON A WHELK SHELL, WITH HERMIT CRAB 154 104. LARVA OF THE BRITTLE STARFISH 158 105. LARVA OF THE FEATHER STAR 160 106. THE ROSY FEATHER STAR 160 107. THE COMMON BRITTLE STAR 162 108. SECTION OF THE SPINE OF A SEA URCHIN 165 109. SEA URCHIN WITH SPINES REMOVED ON ONE SIDE 166 110. APEX OF SHELL OF SEA URCHIN 166 111. SHELL OF SEA URCHIN WITH TEETH PROTRUDING 167 112. INTERIOR OF SHELL OF SEA URCHIN 167 113. MASTICATORY APPARATUS OF SEA URCHIN 167 114. SEA URCHIN DISSECTED, SHOWING THE DIGESTIVE TUBE 168 115. THE SEA CUCUMBER 170 116. A TURBELLARIAN, MAGNIFIED 175 117. _Arenicola piscatorum_ 178 118. THE SEA MOUSE 179 119. TUBE-BUILDING WORMS: _Terebella, Serpula, Sabella_ 182 120. _Terebella_ REMOVED FROM ITS TUBE 183 121. A TUBE OF _Serpula_ ATTACHED TO A SHELL 185 122. _Serpula_ REMOVED FROM ITS TUBE 186 123. THE SEA MAT (_Flustra_) 187 124. _Flustra_ IN ITS CELL, MAGNIFIED 188 125. SEA SQUIRT 189 126. LARVÆ OF MOLLUSCS 191 127. SHELL OF THE PRICKLY COCKLE (_Cardium aculeatum_) SHOWING UMBO AND HINGE; ALSO THE INTERIOR SHOWING THE TEETH 192 128. INTERIOR OF BIVALVE SHELL, SHOWING MUSCULAR SCARS AND PALLIAL LINE 193 129. DIAGRAM OF THE ANATOMY OF A LAMELLIBRANCH 194 130. _Mytilus edulis_, WITH BYSSUS 195 131. A BIVALVE SHELL (_Tapes virgineana_) 196 132. _Pholas dactylus_ 199 133. " " INTERIOR OF VALVE; AND _Pholadidea_ WITH ANIMAL 201 134. THE SHIP WORM 202