| Nemathelminthes and Syndermata | p. XIII |
| Nemathelminthes | p. 1 |
| Gastrotricha - Cycloneuralia | p. 7 |
| Gastrotricha | p. 7 |
| Cycloneuralia | p. 14 |
| Nematoida - Scalidophora | p. 14 |
| Nematoida | p. 14 |
| Nematoda - Nematomorpha | p. 15 |
| Nematoda | p. 15 |
| Nematomorpha | p. 21 |
| Scalidophora | p. 26 |
| Vinctiplicata - Kinorhyncha | p. 27 |
| Vinctiplicata | p. 27 |
| Priapulida - Loricifera | p. 27 |
| Priapulida | p. 27 |
| Loricifera | p. 32 |
| Kinorhyncha | p. 36 |
| On the Position of the Nemathelminthes in the Phylogenetic System of the Bilateria | p. 41 |
| Syndermata | p. 43 |
| Rotifera - N.N. (Seison + Acanthocephala) | p. 47 |
| Rotifera | p. 47 |
| Monogononta - Bdelloida | p. 49 |
| Monogononta | p. 49 |
| Bdelloida | p. 50 |
| N.N.: Seison + Acanthocephala | p. 50 |
| Seison - Acanthocephala | p. 51 |
| Seison | p. 51 |
| Acanthocephala | p. 53 |
| On the Relationships of the Syndermata | p. 60 |
| Radialia | p. 62 |
| Bryozoa | p. 73 |
| Phoronida | p. 84 |
| Brachiopoda | p. 87 |
| Deuterostomia | p. 93 |
| Echinodermata - Stomochordata | p. 101 |
| Echinodermata | p. 101 |
| Crinoida - Eleutherozoa | p. 108 |
| Crinoida | p. 108 |
| Eleutherozoa | p. 112 |
| Asteroida - Cryptosyringida | p. 113 |
| Asteroida | p. 113 |
| Cryptosyringida | p. 118 |
| Ophiuroida - Echinozoa | p. 118 |
| Ophiuroida | p. 118 |
| Echinozoa | p. 124 |
| Echinoida - Holothuroida | p. 125 |
| Echinoida | p. 125 |
| Holothuroida | p. 132 |
| Stomochordata | p. 136 |
| Rhabdopleura - Pharyngotremata | p. 136 |
| Rhabdopleura | p. 136 |
| Pharyngotremata | p. 138 |
| Cephalodiscida - Cyrtotreta | p. 139 |
| Cephalodiscida | p. 139 |
| Cyrtotreta | p. 141 |
| Enteropneusta - Chordata | p. 142 |
| Enteropneusta | p. 142 |
| Chordata | p. 147 |
| Tunicata - Vertebrata | p. 152 |
| Tunicata (Urochordata) | p. 152 |
| "Ascidiacea" | p. 153 |
| Pelagotunicata | p. 155 |
| Pyrosomida | p. 158 |
| Salpida | p. 160 |
| Doliolida | p. 162 |
| Appendicularia | p. 164 |
| Vertebrata | p. 168 |
| Systematization of the Vertebrata · First Section | p. 170 |
| Acrania - Craniota | p. 170 |
| Acrania | p. 170 |
| Craniota | p. 178 |
| Cyclostomata - Gnathostomata | p. 186 |
| Cyclostomata | p. 186 |
| Petromyzonta - Myxinoida | p. 186 |
| Petromyzonta | p. 187 |
| Myxinoida | p. 189 |
| Gnathostomata | p. 190 |
| Chondrichthyes - Osteognathostomata | p. 193 |
| Chondrichthyes | p. 193 |
| Elasmobranchii - Holocephali | p. 195 |
| Elasmobranchii | p. 195 |
| Holocephali | p. 196 |
| Osteognathostomata | p. 197 |
| Actinopterygii - Sarcopterygii | p. 200 |
| Actinopterygii | p. 200 |
| Cladistia - Actinopteri | p. 203 |
| Cladistia | p. 203 |
| Actinopteri | p. 203 |
| Chondrostei - Neopterygii | p. 204 |
| Chondrostei | p. 204 |
| Neopterygii | p. 205 |
| Ginglymodi - Halecostomi | p. 206 |
| Ginglymodi | p. 206 |
| Halecostomi | p. 206 |
| Halecomorphi - Teleostei | p. 207 |
| Halecomorphi | p. 207 |
| Teleostei | p. 207 |
| Sarcopterygii | p. 209 |
| Actinistia - Choanata | p. 211 |
| Actinistia | p. 211 |
| Choanata | p. 212 |
| Dipnoi - Tetrapoda | p. 217 |
| Dipnoi | p. 217 |
| Tetrapoda | p. 219 |
| On Fossil Records of the Choanata | p. 221 |
| Systematization of the Vertebrata · Second Section | p. 222 |
| Amphibia - Amniota | p. 223 |
| Amphibia | p. 223 |
| Batrachia - Gymnophiona | p. 227 |
| Batrachia | p. 227 |
| Urodela - Anura | p. 227 |
| Urodela | p. 227 |
| Anura | p. 229 |
| Gymnophiona | p. 231 |
| Amniota | p. 232 |
| Sauropsida - Mammalia | p. 234 |
| Sauropsida | p. 234 |
| Chelonia - Diapsida | p. 235 |
| Chelonia | p. 236 |
| Diapsida | p. 238 |
| Lepidosauria - Archosauria | p. 238 |
| Lepidosauria | p. 238 |
| Rhynchocephalia - Squamata | p. 239 |
| Rhynchocephalia | p. 239 |
| Squamata | p. 240 |
| Archosauria | p. 243 |
| Crocodylia - Aves | p. 244 |
| Crocodylia | p. 244 |
| Aves | p. 245 |
| Paleognathae - Neognathae | p. 249 |
| Paleognathae | p. 249 |
| Neognathae | p. 251 |
| On the Stem Lineage of the Aves | p. 252 |
| Mammalia | p. 257 |
| Monotremata - Theria | p. 262 |
| Monotremata | p. 262 |
| Theria | p. 266 |
| Marsupialia - Placentalia | p. 267 |
| Marsupialia | p. 267 |
| Placentalia | p. 271 |
| On the Stem Lineage of the Mammalia | p. 273 |
| Chaetognatha | p. 277 |
| References | p. 287 |
| Index | p. 307 |
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