CONTENTS 



PAGE 



INTRODUCTION 1 



1. The Linnaean system of classifying animals 1 



2. The study of animals in America . . 5 



SYNOPSIS OF INVERTEBRATE ANIMALS 



PHYLUM 1. PROTOZOA 11 



Class 1. Sarcodina 14 



Class 2. Mastigophora 24 



Class 3. Sporozoa 42 



Class 4. Infusoria 48 



PHYLUM 2. COELENTERATA 70 



Subphylum 1. Spongiaria 71 



Class 1. Calcarea 75 



Class 2. Hexactinellida . 77 



Class 3. Demospongiae 78 



Subphylum 2. Cnidaria 86 



Class 1. Hydrozoa 90 



Class 2. Scyphozoa 125 



Class 3. Anthozoa 132 



Subphylum 3. Ctenophora 150 



Class 1. Tentaculata 151 



Class 2. Nuda 154 



PHYLUM 3. VERMES 155 



Subphylum 1. Plathelminthes 156 



Class 1. Turbellaria 157 



Class 2. Trematodes 171 



Class 3. Cestodes 189 



Class 4. Nemertea 203 



Subphylum 2. Nemathelminthes 213 



Class 1. Nematoda 214 



Class 2. Gordiacea 225 



Class 3. Acanthocephala 228 



Subphylum 3. Trochelminthes 230 



Class 1. Rotifera 230 



Class 2. Gastrotricha .243 



Class 3. Kinorhyncha 244 



