TABLE OF CONTENTS. 



CHAPTER IV. 



PAGE 



PHYLUM COELENTERATA . 99 



SUB-PHYLUM I. CNIDARIA . 123 



Class I. HYDROMEDUSAE 



(CRASPEDOTA) 123 



Order 1. Hydrida . .127 



,, 2. Hydrocorallinae . 127 



3. Tubulariae . .129 



Anthomedusae . 130 



4. Campanulariae . 132* 



Leptomedusae . 133 



,, 5. Trachomedusae . 135 



6. Narcomedusae . 136 



,, 7. Siphonophora. . 137 



Sub-order 1. Disconanthae . 141 



Section 1. Disconectae 



(Velellidae) 141 



Sub-order 2. Siphonanthae . 144 

 Section 1. Calyconectae 



(Calycophoridae) 144 

 ,, 2. Physonectae 



(Physophoridae) 150 



,, 3. Auronectae . 153 



,, 4. Cystonectae 



(Physalidae) 154 



Class II. ACALEPHAE 



(ACRASPEDA) 156 



Order 1. Scyphomedusae . 162 



Sub-order 1. Stauromedusae 163 



,, 2. Peromedusae . 165 



3. Cubomedusae . 166 



Order 2. Ephyroninae . . 166 



Sub-order 1. Cannostomae . 167 



,, 2. Semostomae . 167 



,, 3. Rhizostomae . 167 



Class III. ACTINOZOA 



(ANTHOZOA) 168 

 Order 1. Rugosa . . .175 

 ,, 2. Alcyonaria 



(Octactinia) 175 



Sub-order 1. Protoalcyonaria 17 '8 



,, 2. Stolonifera . 178 



,, 3. Alcyonacea . 178 



,, 4. Pennatulacca . 179 



Section 1. Pennatulea . 180 



,, 2. Spicata . . 181 



,, 3. Renillea . . 181 



,, 4. Veretiliea . . 181 



Sub -order 5. Gorgonacea . 181 



Section 1. Scleraxonia . 182 



,, 2. Holaxonia . , 182 



CHAPTER IV. COELENTERATA contd. 



PAGE 



Order 3. Zoantharia 



(Hexactinia) 183 



Sub-order 1. Actiniarin . 183 



Section 1. Hexactiniae . 186 



,, 2. Paractiniae . 188 



,, 3. Protactiniae . 189 



,, 4. Echvardsiae . 189 



,, 5. Zoantheae . . 189 



,, 6. Ceriantheae . 190 



Sub-order 2. Antipatharia . 190 



,, 3. Madreporaria . 191 



Section 1. Aporosa . . 194 



2. Fungida . . 196 



., 3. Perforata . .196 



SUB-PHYLUM II. CTENOPHORA 197 



Order 1. Tentaculata . . 207 



Section 1. Cydippidae . 207 



2. Lobatae . . 207 



3. Cestidae . . 208 



Order 2. Nontentaculata . 208 



CHAPTER V. 



PHYLUM PLATYHELMINTHES . 209 



Class I. TURBELLARIA . 210 



Order 1. Acoela . .218 



,, 2. Rhabdocoela . .219 



,, 3. Alloiocela . . 220 



,, 4. Triclada . . 221 



,, 5. Polyclada . . 222 



Acotylea . . 222 



Cotylea . . 223 



Class II. TREMATODA . . 223 

 Order 1. Heterocotylea 



(Monogenea) 233 



,, 2. Aspidocotylea . 236 

 3. Malacotylea 



(Digenea) 237 



Dicyemidae and Orthonectidae 240 



Class III. CESTODA . 243 



CHAPTER VI. 



PHYLUM NEMERTEA . . 263 



Order 1. Protonemertini . 270 



,, 2. Mesonemertini . 270 



,, 3. Metanemertini . 271 



4. Heteronemertini . 272 



