LIST OF ILLUSTRATIONS. 



PAGE 



72 

 7i 

 75 



17. Animals in which Clilorophyll Grains have been detected 



18. Cullnzotim inei'me Qiaeckel) ...... 



19. Section through Sphenopiis Steenstrufii .... 



20. a, Pi'otevs from the Adeleberg Grotto, reduced ; h. Section o: 



a Rudimentary Eye ....... 



21. a, Pinnotheres Holothurice, nat. size ; i, degenerate Water 



lung of the Wohthmia 80 



23, Zoea-larva of Pinnotheres Hohtlinrice . .81 



23. A blind Cymothoe ; in fresh water . . . .83 



21. Sircdon pisciforme, the Mexican Axolotl .... 



25. Hection 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 Eossbach . . . 107 



29. ZJi'.swHfl ly/aCTafis, the Glacier Flea . . . . . 117 



30. A])lds Beeeabungm .... . . 123 



31. a, Diploznon paradoximi ; J, Polijstoiimni intcr/crrimuin, from 



the Bladder of a Frog 121 



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



33. Apus 128 



31. Eupleetella asperffillum ....... 137 



35. Halohaies, new sp. . . . . . . . . Ill 



86. Pachijdrihis, new sp., living in the Salt Waters of Kissingen 145 



37. Platiirus vulcanicus ....... 116 



38. jBopt/ru-s aseendens ....... . 117 



39. An Oyster from the ri\'er Cumalaran in Basilan . . . 148 



40. Covdylophm'a laciistris ........ 152 



41. a, Braneliipus starjnaUs ; h, Arteinia salina . . . .156 



42. Transformation of J?'^«/«i« s«K«ff into j1. Milhaiisenii . . 157 



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



Brood . . 161 



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



45. Curve of Time of Growth of Lymnaa star/nalis . . 16.9 



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



47. a, Anahas seaadens \ h, a Tadpole ; c, a young Poly pterus 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 fossiKs . . 172 



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



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



53. Geonemertes 2iai^ensis,a,'Sem.eriea,'a; nat. size . . . 187 



54. Talitnis saltator 188 



