. Mouth appendages of cockroach—after Dufour 
. Transverse section of insect—after Packard . 
. Head and mouth parts of bee—after Cheshire 
. Nervous system of bee—after Cheshire 2 
. Food canal of bee—in part after Cheshire 
. Hive-bees and the cells in which they develop 
. Mouth-parts of mosquito—from Nuttall and Shipley 
. Young may-fly or ephemerid—after Eaton . 
. Diagrams of insect embryo—after Korschelt and Heider 
. Life histories of insects 
. Life history of the silk-moth ‘(Bombyx mori) 
. Development of blow-fly ne erythrocaphala) —ateer 
LIST OF ILLUSTRATIONS. 
. Female reproductive organs of crayfish—after Siskow : 
- Section through the egg of, Astacus aftér the completion of 
segmentation—after, Reichenbach 
. Longitudinal section of later embryo of Astacus—after 
Reichenbach 
. Section through cephalothorax ofa crab—after Pearson 
. Dorsal aspect of swimming crab (Portunusy 
. Dorsal aspect of shore crab (Carcinus) 
. Ventral aspect of female shore crab . 
- Dorsal surface of. Apus cancriformis — from “Bronn’s 
_  Thierreic! . 
. Daphnia 
Cypris 
. Cypris, side view, after removal of o1 one valve—after “Zenker, 
. Cyclops type . 
. Acorn-shell (Balanus tintinnabulum)—after Darwin 
. Development of sail china (Not drawn to 
scale). . ‘ . 2 
. Nebatia—after Sars... . . 
. Anaspides—after Calman. 5 ‘ : 
. An Amphipod (Caprella linearis) . ; . ‘ 
. Hermit-crab withdrawn from its shell. The anterior ap- 
«, pendages are broken off ‘ A : . 
. Mysis flexuosa, from side 
. Nervous system of shore-crab ( Carcinus manas)—afier Bethe 
. Zozea.of common shore-crab (Carcinus menas)—after Faxon 
. External form of Peripatus—after Balfour . 
. Dissection of Peripatus—after Balfour 
. Embryos of Peripatus capensis, showing closure of blasto- 
pore and curvature of i ala Korschelt and Heider 
. A millipede . . a . . . 
. Acentipede . . 3 . 
. Female cockroach (P. ortentalis) ane : 
Male cockroach (P. orzentalzs) 1 
Ventral aspect of male cockroach with the wings: extended. 
An imaginary median line has been inserted 
. Leg of cockroach, 
Thomson Lowne 
5 
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