CONTENTS 



CHAPTER IX 



PAGE 



Phtl0m X.: MoLLUscA 105 



XJTWoalve Molluscs (AqiuUic Snails). — Common Pond Snails, 

 Trampet Snails, Bladder Snails, Hooked Snails, Fresh-water 

 Winkles, Periwinkles, Whelks, Cowries, Limpets ; directions 

 for practical work ; how to start; a fresh-water tank. 



CHAPTER X 



Phylum X. : Mollusca (continued) 126 



Univalve Molluscs {Land Snails and Slugs). — The Garden 

 Snail, White-lipped Snail, Grove Snail, Apple Snail, Greedy 

 Snail, Chrysalis Snail, Vertigo, Door-shell Snail ; Black 

 Slug, Tree Slug, Cellar Slug, Field Slug, Snail Slug. Classi- 

 fication of Univalve Molluscs ; directions for practical work. 



CHAPTER XI 



Phylum X. : Mollusca (continued) 139 



Bivalve Molluscs. — The Swan Mussel, Orb-shell Cockle, Pea- 

 shell Cockle, Oyster, Sea-mussel, Zebra Mussel, Common 

 Cockle, Scallop. Classification ; directions for practical work. 



CHAPTER XII 



Phylum XI. : Arthropoda. Class I. Crustacea . .153 



Sub-class 1. Malacostraca. — The Common Prawn, Lobster, 

 Crab, Hermit Crab, Fresh-water Shrimp, Sand-hopper, Water 

 Slater, Wood-louse. Sub-olass 2. Entomostraca. — The Water 

 Flea, Cyclops, Cypris, Barnacles. Clsissification of Crustacea ; 

 directions for practical work. 



