73. Lower Ordovician Graptolites 125 74. Lower Ordovician Graptolites 125 75. Upper Ordovician and Silurian Graptolites 127 76. Fossil Crinoids 135 77. Fossil Starfishes 140 78. _Protaster brisingoides_, Gregory, in Silurian Sandstone 142 79. _Gregoriura spryi_, Chapm., in Silurian Mudstone 143 80. Cainozoic Sea-urchins 145 81. Cainozoic Sea-urchins 147 82. Fossil Worms 153 83. Palaeozoic Polyzoa 156 84. Cainozoic Polyzoa 157 85. Lower Palaeozoic Brachiopods 159 86. Silurian and Devonian Brachiopods 161 87. Carbopermian Brachiopods 163 88. Mesozoic Brachiopods 165 89. Cainozoic Brachiopods 167 90. Lower Palaeozoic Bivalves 176 91. Palaeozoic Bivalves 179 92. Carbopermian Bivalves 180 93. Lower Mesozoic Bivalves 181 94. Cretaceous Bivalves 183 95. Cainozoic Bivalves 185 96. Cainozoic Bivalves 186 97. Fossil Scaphopods and Chitons 188 98. Lower Palaeozoic Gasteropoda 192 99. Silurian Gasteropoda 194 100. Upper Palaeozoic Gasteropoda 195 101. Mesozoic Gasteropoda 197 102. Cainozoic Gasteropoda 199 103. Cainozoic Gasteropoda 200 104. Late Cainozoic and Pleistocene Gasteropoda 201 105. Palaeozoic Cephalopoda 206 106. Mesozoic and Cainozoic Cephalopoda 208 107. Diagram restoration of an Australian Trilobite (_Dalmanites_) 224 108. Cambrian Trilobites 226 109. Older Silurian Trilobites 228 110. Newer Silurian Trilobites 230