LIST OF ILLUSTRATIONS. 



FIG. PAGE 



146. Female reproductive organs of crayfish after Suckow . 293 



147. Section through the egg of Astacus after the completion of 



segmentation after Reichenbach . . . 294 



148. Longitudinal section of later embryo of Astacus after 



Reichenbach ... ... 



149. Section through cephalothorax of a crab after Pearson 



150. Dorsal aspect of swimming crab (Portttuus) 



151. Dorsal aspect of shore crab (Care inns) 



152. Ventral aspect of female shore crab . 



153. Dorsal surface of Apus cancrifonnis from Bronn's 



" Thierreich" ...... 



154. Daphnia . . 



155- Cypris . . . , . 



156. Cypris, side view, after removal of one valve after Zenker 



157. Cyclops type. ...... 



158. Acorn-shell (Balanus tintinnabnhun} after Darwin 



159. Development of Sacculina after Delage. (Not drawn to 



scale) ....... 



1 60. Nebalia after Sars ...... 



161. Anaspides after Caiman ..... 



162. An Amphipod (Caprella linear is] .... 

 i62A. Dorsal view of a wood-louse (Oiiiscus) after Webb and 



Sillem ...... Facing 



163. Hermit-crab withdrawn from its shell. The anterior ap- 



pendages are broken off .... 



164. Mysis Jhxuosa^ from side ..... 



165. Nervous system of shore-crab ( Care inns t/iu'iias) after Bethe 



1 66. Zooea of common shore-crab (Carcimis Hyenas} after Faxon 



167. External form of Peripatns after Balfour . 



1 68. Dissection of Peripatns after Balfour 



169. Embryos of Peripatus capensis, showing, closure of blasto- 



pore and curvature of embryo after Korschelt and Heider 



170. A millipede . . . . . 



171. A centipede . ...... 



I7IA. Mouth-parts and poison claws of a centipede .Facing 

 1716. Mouth-parts of a millipede . . . . ,, 



172. Female cockroach (P. orientalist . . . . 



173. Male cockroach (P. orientals) 



174; Ventral aspect of male cockroach with the wings extended. 

 An imaginary median line has been inserted 



175. Leg of cockroach ...... 



176. Mouth appendages of cockroach . . .Facing 



177. Transverse section of insect after Packard . 



178. Head and mouth parts of bee after Cheshire 



179. Nervous system of bee after Cheshire 



1 80. Food canal of bee in part after Cheshire . 



181. Hive-bees and the cells in which they develop 



182. Mouth-parts of mosquito from Nuttall and Shipley 



183. Young may-fly or ephemerid after Eaton . 



184. Diagrams of insect embryo after Korschelt and Heider 



b 



