97. A Planarian which has been divided into two by a longitudinal cut 14 98. The leg of a Crab, adapted for self-mutilation or autotomy 17 99. Regeneration of the lens in a Newt's eye 21 100. Regeneration of Planarians 25 101. A Starfish arm 27 76 (repeated). Diagram of the maturation divisions of the ovum 39 82 (repeated). Fertilization in the Lily 59 91 (repeated). Hind-leg of a Grasshopper 83 102. Brush and comb on the leg of a Bee 84 103. Claw on the leg of a 'Beach-fly' 85 104. Digging leg of the Mole-cricket 86 105. Ovary of a fertile Queen-Ant and ovaries of a Worker 91 106. Three Workers of the same species of Indian Ant 97 107 _A_, _B_. Larva of a Caddis-fly 105 107 _C_. Leptocephalus stage of an American Eel 133 108. Nauplius larva of one of the lower Crustaceans 161 109 _A_, _B_. Metamorphosis of one of the higher Crustacea, a Shrimp 162 109 _C_. Second Zoæa stage 163 109 _D_, _E_. Mysis-stage and fully-formed Shrimp 164 70 (repeated). Daphnella 166 110. The largest of the Daphnids (_Leptodora hyalina_), with summer ova beneath the shell 166 111. Nauplius larva from the winter egg of _Leptodora hyalina_ 167 112. Development of the parasitic Crustacean _Sacculina carcini_ 168, 242 113. The two sexes of the parasitic Crustacean _Chondracanthus gibbosus_ 170 114. Zoæa-larva of a Crab 171 115. Caterpillar of the Humming-bird Hawk-moth _Macroglossa stellatarum_ 178 3 (repeated). Full-grown caterpillar of the Eyed Hawk-moth 178 4 (repeated). Full-grown caterpillar of the Eyed Hawk-moth 179 8 (repeated). Caterpillars of the Buckthorn Hawk-moth 179 116. Development of the eye-spots in the caterpillar of the Elephant Hawk-moth _Chærocampa elpenor_ 180 117. Caterpillar of the Bed-straw Hawk-moth _Deilephila galii_ 181 118. Two stages in the life-history of the Spurge Hawk-moth _Deilephila euphorbiæ_ 182 119. Caterpillar of the Poplar Hawk-moth _Smerinthus populi_ 184