XIV LIST OF ILLUSTRATIONS. 



FIG. P AGE 



in. Longitudinal section oflaterembryoof--7jtf«««(Reichenbach) 262 



112. Embryo of crayfish, flattened out, with removal of yolk 



(greatly magnified) (Reichenbach) .... 263 



113. Dorsal surface of Aptis cancriformis (Bronn's " Thierreich ") 265 



114. Acorn-shell (Balanus tintinnabulum) (Darwin) . . . 268 



115. Development of Sacculina (Delage) . 269 



116. An Amphipod ( Caprella linea ris) . . . 272 



117. Schizopod (Mysisflexuosa), from side . . ■ 273 



118. Nervous system of shore-crab (Carcinus memos) (Bethe) 274 



119. Zoa^a of common shore-crab {Carcinus memos) (Faxon) 277 



120. External form of Peripatus (Balfour) . . . 282 



121. Dissection of Peripatus capensis (Balfour) .... 284 



122. Embryos of Peripatus capensis, showing closure of blastopore 



and curvature of embryo (Korschelt and Heider) . 285 



123. A millipede . .... 287 



124. A centipede .... 287 



125. Female cockroach {Periplaneta orientalis) 289 



126. Male cockroach {P. orientalis) . . 289 



127. Leg of cockroach . . 291 



128. Mouth appendages of cockroach ( Dufour) 291 



129. Transverse section of insect (Packard) . . 292 



130. Head and mouth-parts of bee (Cheshire) 296 



131. Nervous system of bee (Cheshire) . . 297 



132. Food canal of bee (Cheshire) . . . 298 



133. One of the Thysanura, Campodea staphylimis (Lubbock) . 300 



134. Young may- fly or ephemerid (Eaton) . . . 302 



135. Diagrammatic cross-section of an Invertebrate, with the 



ccelom (be.) shaded (Ziegler) . . . . 308 



136. Diagrammatic cross-section of an Invertebrate, with a ccelom 



and a ha^moccel (Ziegler) ...... 309 



137. Diagrams of Insect embryo (Korschelt and Heider) . 312 



138. Life history of the silk-moth, Bombyx mori . . 315 



139. Development of blow-fly, Calliphora erythrocephala 



(Thompson Lowne) .... 316 



140. Scorpion ....... . 323 



141. Dissection of My 'gale from the ventral surface (Cuvier) . 327 



142. Section of Lung-book (Macleod) . . . 328 



143. Limulus or king-crab . . . 333 



144. Young Limulus (Walcott) . . . 334 



145. Trilobite, Conocephalites (Barrande) . . . 335 



146. Vertical cross-section of a Trilobite, Calymene (Walcott) 336 



147. Sea-spider, Pycnogonum littorale, from the dorsal surface 336 



148. Ideal mollusc (Ray Lankester) . . . . 338 



149. Stages in Molluscan development . 338 



150. Dissection of Helix pomatia (Leuckart) 34c 



151. Diagram of larva of Paludina (Erlanger) . . . 346 



152. Nervous system of Molluscs .... 349 



153. Structure of Anodonta (Rankin) . . . . 351 



154. Development of Anodonta (Gcette) . . 31-4 



155. External appearance of a cuttlefish . . 356 



