CONTENTS 



Land Snails: What Thev Are and Where Thev Live 3 



P'ood and Feeding Habits of Snails 5 



How Snails Reproduce 9 



Where Land Snails Live 9 



Collecting Land Snails 11 



Apparatus tor the Collector 13 



Preserving Specimens 15 



Labels and Cabinets 16 



Classification of Land Snails 17 



How to Identify Land Shells 20 



Economic Importance ot Land Snails 23 



Collectors of Illinois Land Snails 25 



Physiography of Illinois 26 



Mollusks in Geological History 30 



The Land Snail Fauna of Illinois 33 



Land Snails Native to Illinois 37 



Class Gastropoda 37 



Order Prosobranchiata 39 



Family Helicinidae 39 



Order Pulmonata 40 



Suborder Stylommatophora 40 



Family Polygyridae 40 



Family Bulimulidae 63 



Family Zonitidae 64 



Family Endodontidae 83 



Family Haplotrematidae 91 



Family Pupillidae 93 



Family Strobilopsidae 110 



Family Valloniidae 116 



Family Cochlicopidae 120 



Family Succineidae 121 



Family Limacidae 128 



Family Philomycidae 131 



Suborder Basommatophora 135 



Family PUlobiidae 135 



Land Snails Introduced From Foreign Countries 139 



Species With Shells 139 



Introduced Slugs 141 



Land Snails of Uncertain Presence in Illinois 147 



Bibliography 153 



Check. List of Illinois Species 159 



Index 161 



xi 



