CONTENTS 



CHAPTER IX 



PAGE 



PHYLUM X.: MOLLUSCA . . . . . . . . 105 



Univalve Molluscs (Aquatic Snails}. Common Pond Snails, 

 Trumpet Snails, Bladder Snails, Hooked Snails, Fresh-water 

 Winkles, Peri winkles, Whelks, Cowries, Limpets ; directions 

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



CHAPTER X 



PHYLUM X. : MOLLUSCA (continued] . . . . .126 



Univalve Molhiscs (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 XL: 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-CLASS 2. Entomostraca. The Water 

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

 directions for practical work. 



