FIGURES IN THE TEXT 



PAGE 



26. Skull of a Murry 148 



27. Skull of a Pit Viper . . . . . 149 



28. Thread-cell . . . . . . .152 



29. Body of a Torpedo (dissected) . . . 1 60 



30. Electric Catfish 162 



31. Electric Eel ...'... 164 



32. Lines of electric discharge in the Electric Eel . . 166 



33. Cyclops 176 



34. Leptodor a kindti Focke 179 



35. Bythotrephes longimanus . . . . .182 



36. Bosmina longispina . . . . . .186 



37. Water- flea . . . . . . . .190 



38. European Perch . . . . . . 195 



39. Pike-perch. . . . . . . .196 



40. Californiah Salmon . . . . . .198 



41. Rainbow Trout ....... 199 



42. The Char . . 203 



43. The Wels 204 



44. Catfish 206 



45. Respiratory movements in the Scorpion- fish . .212 



46. Transverse section of the barbel of a Bearded Mullet 242 



47. Taste-buds in the Bearded Mullet . . . -243 



48. Median section of a Basilisk Blenny's eye . . 259 



49. Structure of the retina in the Basilisk Blenny . . 262 



50. Section through a scale of the lateral line of a 



Red-eye . . . . . . . . 27 1 



5 1 . Transverse section, of the tube which perforates the 



scale ........ 273 



52. Sea-cucumber or Holothurian and Fierasfer . . 286 



Vlll 



