CONTENTS. Vll 



PAGE 



Phylum VI. Chordata, . . . . . . .335 



Subphylum A. Hemichorda, ...... 135 



Subphylum B. Urochorda (Tunicata), . . . . .138 



Order 1. Larvacea (Perennichordata), ..... 138 



Order 2. Ascidiaj, . . . . . . .138 



Order 3. Thaliacea, .... . . .138 



Subphylum C. Cephalochorda (Acrania), ..... 143 



Subphylum D. Vertebrata (Craniata), . . . . .146 



Table of Vertebrate Groups. . . . . . .147 



Class I. Cyclostomi (Marsipobranchii), ..... 148 



Order 1. Hyperotreti, . . . . . . .148 



Order 2. Hyperoartia, . .148 



Class II. Pisces, . . . . . . . .153 



Order 1. Selachii (Elasmobranchii), ..... 153 



Order 2. Holocephali, . . . . . . .153 



Order 3. Ganoidei, . . . . . . .153 



Order 4. Teleostei, . . . ... . .157 



Order5. Dipnoi, . . . . . . .161 



Class III. Amphibia, ....... 164 



Order 1. Urodela (Caudata), . .164 



Order 2. Batrachia (Anura), . . . . . .164 



Order 3. Apoda (Gymiiophioua), . . . 164 



Order 4. Stegocephali, . . 164 



Class IV. Reptilia, ... ... 168 



Lepidosauria (Plagiotremata), ...... 168 



Order 1. Lacertilia (Sauria), . . . . . .168 



Order 2. Pterosauria, . . . . . .168 



Order3. Ophidia, . . 168 



Hydrosauria, . .174 



Order 4. Enaliosauria, . . . . .174 



OrderS. Crocodilia, . . . . . . .174 



Order 6. Chelonia, ... ... 174 



Order 7. Dinosauria, . . . . . .174 



Class V. Aves, . . . 180 



Order 1. Saururse, . . .... 180 



Order 2. Ratitae ... . .180 



Order3. Cariuatae, . . . . . . .183 



