INDEX. 



271 



PAGE 



Dicyrtoma Lueasii . . 119 



— craniensis . . . 119 

 Digestive canal of tlie Thy- 



sanura .... 208 



— organs of tlie CoUembola 73 



E. 



Eggs .... 82, 210 

 Egg-tube . . . .209 

 Embryology of Isotoma 84 — 89 

 Essential points in relation 



to classification ... 35 

 Evolution of the Insecta, 

 relation of the Collembola 

 and Thysanura to tbe . 40 

 — , sequence of the . . 52 

 Experiments on antennae . 62 

 Eye of Lipura fimetaria . 57 



F. 



Fabriciiis, species described 

 by 7,10 



Families of Thysanura, La- 

 treille's characters of, . 11 



Forbicina, Geoftroy's charac- 

 ter of 6 



Forbicina cylindrica . . 6 



— plana . . . 6,218 



— polypoda .... 236 

 • — saccharina ... 9 

 Fritz Miiller's views on the 



development of Insects 41, 45 



G. 



Genera, Bourlet's characters 



of . . . 14,17 



— , Nicolet's tables of . 20, 26, 27 

 Genera of Collembola and 



Thysanura ... 39 

 General description of the 



Collembola ... 55 

 General organization of the 



Thysanura . . .201 



Generative organs . 81, 208 

 GeoflFroy's classification . 6 

 Gervais on the Thysanura . 32 

 Gervais's species ... 23 



H. 



Habitats of Collembola and 

 Thysanura ... 1 



PAGE 



Habits of the Collembola . 72 

 Hjickel on the development 



of Insects 

 Head of Collembola 

 Heterotoma . 



— cincta 



— crystallina 



— flavescens 



— grisea 



— livida 



— musci 

 pulchricornis 



53 



56 



14, 59 



. 15, 24, 130 



. 15, 24, 143 



. 15, 24, 134 



15, 24, 131, 132 



. 15, 24, 130 



15. 24, 129, 130 



15, 24, 129, 130 



— quadripunctata 15, 24, 129, 130 



— septempunctata . . 15 



— vaga . . 15, 24, 129, 130 



— villosissima . 15, 24, 131, 132 



— chlorata ... 24, 169 



— septemguttata . 24, 129, 130 

 Hexapods, forms of mouth 



among .... 50 



Hypogastrura 



— agaricina . 



— aquatica . 



— fusco-viridis 



— murorum . 



14,17 



16, 179 



15, 16, 186 



16, 178 



16, 182 



I. 



lapyidae .... 214 



lapyx . . . 201,202,215 

 ^ gigas . . . .216 



— solifugus .... 215 

 Importance of the mouth 



parts 48 



Insecta, importance of the 



Collembola and Thysanura 



in relation to the evolution 



of the .... 40 



Insects, Fritz Miiller's views 



on the development of . 41 

 — , larvae of . . . .44 

 — , nature and origin of the 



wings of . . . .53 

 Internal anatomy of the Col- 

 lembola .... 73 



of the Thysanura . 207 



Isotoma . . 14,27,39,167 



— , embryology of . 84—89 



— , larva of . . . .89 



— anglicana . . . .171 



— annulata . 21, 24, 175 



— aquatilis, 8, 15, 16, 21, 24, 72, 170 



— arborea, 3, 5, 7, 8, 10, 13, 15, 16, 



21,24,167 



