CONTENTS. Xlll 



CHAPTER XXI. 



CRUSTACEANS. 



Cirripedes Barnacles and Acorn-shells Edriophthalmia Decapoda Their 

 Branchial Apparatus Legs and Digestive Organs Moulting Process Meta- 

 morphoses Enemies of the Crustaceans Means of Defence, and Offensive 

 Weapons The Birgus Pinnotheres Paguri Migratory Instinct of the Land- 

 crabs ........ PAGE 175 



CHAPTER XXII. 



Their Integuments Their Metamorphoses Larvse Pupse Perfect Insects An- 

 tennae Eyes Masticatory Organs Chewing and Sucking Insects Digestive 

 Organs of the Carnivorous and Herbivorous Insects Motions of Insects 

 Elateridse Aquatic Insects Foot of the Fly Wings Respiratory Organs- 

 Tracheae and Stigmata The Butterfly's Wing under the Microscope Defences 

 of Insects Vitality Concealments The Caddice Fly The small Ermine Moth 

 The Clothes Moth Hunting Manoeuvres of the Mantis The Ant-Lion The 

 Larva of the Tiger Beetle Insect Plagues Insects Useful to Man -Their 

 Numberless Enemies Their Wonderful Instincts Care for their Young The 

 Rhynchites Betulse Dung and Sexton Beetles Their Remarkable Intelli- 

 gence The Sand Wasp Ichneumon Flies Breeze Flies The Earwig The 

 Mole Cricket The Dirt Dauber and Trypoxylon The Leaf-cutters The 

 Carpenter Bee The Chartergus Nidulans The Hive Bee The Ants and Ter- 

 mites 189 



CHAPTER XXIII. 



SPIDERS. 



Venomous Apparatus Spinnarets The Spider's Web Patience of the Spiders 

 Hunting Spiders Trap-door Spiders Water Spiders The Raft Spider 

 Enemies of the Spiders Their Fecundity Their Maternal Affection Th<> 

 Stalita Turn aria . . . . ... . . - . !23o 



CHAPTER XXIV. 



FISHES. 



The Waters a Scene of constant War Fecundity of Fishes necessary to maintain 

 the Equilibrium Migrations of the Salmon Means of Defence and Attack 

 The Dragon Weever The Acanthurus The Catfish The Sting-ray Dental 

 Apparatus of Fishes Teeth of the Lamprey andScari The Sawfish Electrical 

 Fish Fins Air-bladders Gills Respiratory Apparatus of the Lamprey and 

 Hag of the Frogfish and Hassar The Star-gazer The Angler The Ros- 

 trated Chsetodon The Senses of Fishes Beautiful Construction of their Eye 

 Care of the Stickleback for its Young Parental Solicitude of the Black Goby 

 and of the Hassar . . . . . 247 



