xiv LISr OF ILLUSTRATIONS. 



PAOE 



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



1 8. Collozoum iiterme (Haeokel) 74 



19. Section through Splieiiojms Steenstni,pii ..... 75 



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



a Eudimentary Eye 78 



21. a, Pinnotheres Holothmics, mA. size; 6, degenerate Water- 



lung of the Holathuria ....... 80 



22. Zoea-larva of Pinnotheres Ilolothurice . . . . . 81 



23. A blind Cymothoe ; in fresh water . . . . . 8.S 



24. Svrcdon pisoifm'7tie, the Mexican Axolotl 88 



25. Section of a Frog's Skin 92 



26. Chromatophores of a Frog's Skin 93 



27. Kossbach'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. Besona. glaoialis, the Glacier Plea 117 



30. Ajyhis Becoabvmgce 123 



31. a, Diphmnn paradoxum ; J>, Pulystovmm integerHmwiii, from 



the Bladder of a Frog 124 



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



33. A2ms 128 



34. Euplectella- aspe^-gillnm. 137 



35. Halobates, new sp. 144 



36. Padliy&rilus, new sp., living in the Halt Waters of Kissingen 145 



37. Platvrus vulpanietis 146 



38. Bo^yrus ascendeiis 147 



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



40. Cordyloplwra lacnstris . . . . ' . . . . 152 



41. a, Bra,nchip%s sta^gnalis ; b, Arteyma salina . . . .156 



42. Transformation of Artemia salina into A. Milhanseuii . . 157 



43. Four Shells of Lymncea stagiwMs, all of the same Age and 



Brood . 161 



44. Curve of Volume for Lymnrea stagnalis ..... 163 



45. Curve of Time of Growth of Lym/ncea stagnalis . . .163 



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



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



the Nile ; d, Embryo of a Shark 1 68 



48. Gills of MoUusca . 170 



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

 60. Cobitis fossilis 172 



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



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

 63. ffeonemertes palaensis, a 'Semertean ; nat. size . . . 187 

 54. Talitms saltator , . . . , , . . . . 188 



