LIST OF ILLUSTRATIONS 



XIX 



FIG. 



193. Nehalia — after Sars ...... 



194. Anaspides — after Caiman ..... 



195. An Amphipod [Caprella linearis) .... 



196. Dorsal view of a wood-louse {Oniscus) — after Webb and 



Sillem ....... 



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 Hermit-crab withdrawn from its shell.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



pendages are broken off . 



198. Mysis flexuosa, from side ..... 



199. Nervous system of shore-crab {Carcinus mcenas) — after Bethe 



200. Partial peripheral segmentation of the ovum — characteristic 



of Arthropods ...... 



201. Zoaea of common shore-crab {Carcinus mcenas) — after Faxon 



202. External form of Peripatus — after Balfour 



203. Dissection of Peripatus — after Balfour 



204. Embryos of Peripatus capensis, showing closure of blasto 



pore and curvature of embryo — after Korschelt and 

 Heider 



205. A millipede 



206. A centipede 



207. Mouth-parts and poison claws of a centipede 



208. Mouth-parts of a millipede 



209. Female cockroach (P. orientalis) 

 209A. Male cockroach (P. orientalis) 



210. Mouth-parts of cockroach 



211. Ventral aspect of male cockroach with the wings extended 



An imaginary median line has been inserted 



212. Leg of cockroach ..... 



213. Transverse section of insect — after Packard . 



214. Head and mouth-parts of bee — after Cheshire 



215. Nervous system of bee — after Cheshire 



216. Food canal of bee — in part after Cheshire 



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



218. Mouth-parts of mosquito — after Nuttall and Shipley 



219. Young may- fly or ephemerid — after Eaton 



220. Life-histories of insects . 



221. Life-history of the silk-moth {Bombyx fnori) 



222. A typical caterpillar 



223. Development of blow-fly {Calliphora erythrocephala) — after 



Thompson Lowne .... 



224. Fly about to emerge from pupa-case — after Hayek 



225. Anufida maritima (after Imms), one of the primitive wing 



less Collembola ...•., 



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