XIV LIST OF ILLUSTRATIONS. 



PAGE 



17. Animals in which Chlorophyll Grains have been detected . 72 



1 8. Collnxoum inerme (Haeckel) 74 



19. Section through SjrfieiwjHis Steenstrujni 75 



20. a, Proteus from the Adelsberg Grotto, reduced ; b, Section of 



a Rudimentary Eye 78 



21. a, Pinnotheres Holothnria, nat. size ; b, degenerate Water- 



lung of the Holothuria ....... 80 



22. Zoea-larva of Pinnotheres Holothurice 81 



23. A blind Cymothoe ; in fresh water .83 



24. Sircdon jrisciforme, the Mexican Axolotl 88 



25. Section of a Frog's Skin 92 



26. Chromatophores of a Frog's Skin 93 



27. Rossbach's Curves of Temperature for the Action of the Con- 



tractile Vesicles of the Infusoria 106 



28. The Infusoria experimented on by Rossbach . . . . 107 



29. Dcsoria glacialis, the Glacier Flea 117 



30. Ajrftis Beccabungee ......... 123 



31. a, Difloztwn paradoxum ; b, Poli/stomitin integerriinum, from 



the Bladder of a Frog 124 



32. Phasma sp., a Wingless Orthopterous Insect . . 127 



33. AJJUS 128 



34. Euplectella aspergillum . . . . . . 137 



35. Halobatest, new sp. , . . . . . . . .144 



36. Pachydrilus, new sp., living in the Nalt Waters of Kissingen 145 



37. Platurus vulcanic tn .146 



38. Bopyrns asccndcns . 147 



39. An Oyster from the river Cumalaran in Basilan . . .148 



40. Cordylopliora lacitstris ........ 152 



41. a, BrancJiipus stagnal\s ; b, Artemia salina .... 156 



42. Transformation of Artemia salina into A. Milhause.tiii . . 157 



43. Four Shells of Lymnaa stagnalis, all of the same Age and 



Brood 161 



44. Curve of Volume for Lyiiincea stagnalis . . . . . 162 



45. Curve of Time of Growth of Lymncea stagnalis . . .163 



46. A similar Curve altered by the Effects of Temperature . . 164 



47. a, Anabas scandens ; b, a Tadpole ; c, a young Polypterus from 



the Nile; d, Embryo of a Shark 168 



48.- Gills of Mollusca . 170 



49. Portion of the Stomach of a Holothurian . . . .171 



50. Cobitis fossilis 172 



51. Section through the Lung of the Embryo of a Pig . .179 



52. Systems of Tracheae sketched in the Outline of the Insects . 180 



53. Geoncmertes palaensis, a Nemertean ; nat. size , . . . 187 



54. Talitms saltator . 188 



