Egg, 9, 10, =10=, =11=, inset facing =10= " segmentation of, 11, inset facing =10= Embryo, 10, =11= Endoderm, 10, inset facing =10= Essex, Woodlice recorded from, 44 Excretory organs, 7 Exhibition of species new to Britain, 45 Exmoor, woodlice and ants on, 14 External structure, 2 Flagellum, 3, =3= Food, 13, 14 Ganglia, cerebral 8 Geological history, 1 Genera, 17 Gill, 5, =5= Gills, 7, =6= _Glomeris marginata_, 15 Grammar sows, 16 Growth, time required for, 12 Gullet, 6 Gut, fore, inset facing =10= " mid, inset facing =10= Habits, 12 Hall, Miss Kate M., 31 _Haplophthalmus_, 22 " characters of, 17, 18, 26 " _danicus_, 44, Plate viii. " " description of, 27 " " flagellum of, =27= " _elegans_, 26 " _mengii_, 44, 45, Plate vii. " " description of, 26 " " flagellum of, =26= Head, 2, =2=, =3= Heart, 6, 7, =7=, 11 Herefordshire, Old Red Sandstone, 1 History, geological, 1 _hoffmannseggii, Platyarthrus_, description of, 30 Hog-louse, 15 Hogs, little grey, 16 Hydro-cyanic acid gas for destroying woodlice, 14 _hypnorum, Ligidium_, description of, 21 Insects, 1 Intestine, 6, =7= " formation of, in embryo, 10, 11 Isle of Wight, Oligocene of, 2, Oolite of, 2 Isopoda, 1, 19 _Itea crassicornis_, 30 " _laevis_, 22 " _mengii_, 26 " _rosea_, 24 " _riparia_, 22 " _vivida_, 23 Jurassic, Upper, 2 Kinahan, Professor, 19, 28, 30 Kitchenball, 15 Labels, 16 _laevis, Porcellio_, description of, 35 _Ligia_, 21 " branchial nephrocytes, 8 " characters of, 17, 18, 19, 20 " _hypnorum_, 21 " _melanocephala_, 29 " _oceanica_, 44, Plate i. " " description of, 20 " " excretory organs of, 7, 8 " " flagellum of, 20, =20= " _scopulorum_, 20 Ligiae, 17 " characters of, 19 Ligiidae, characters of, 17, 18, 19 _Ligidium_, 19 " characters of, 17, 18, 21 " _hypnorum_, 44, Plate ii. " " description of, 21 " " excretory organs of, 7 " " in Surrey, 19 " _persoonii_, 21 Lip, the lower, 4, =5= " the upper, 4, =5= Lucre pig, 15 Lugdor, 15 Mandibles, 3, =4= Manure, from stables, favourable to woodlice, 14 Maxillae, first, 3, =4= " second, 3, =4= " openings of excretory organs on second, 7 Maxillipeds, 3, =4= _mengii, Haplophthalmus_, description of, 26 Mesoderm, 10, inset facing =10= Methylated spirit, 16 _Metoponorthus_, 21 " characters of, 18, 37