Sub-"ClasII III. Theromorpha. Orders: Pareiasauri, Theriodontia, Anomodontia, Placodontia.
Sub-"ClasII IV. Chelonia. Orders: Athecae, Thecophora.
Sub-"ClasIII V. Dinosauria. Orders: Sauropoda, Theropoda, Orthopoda, Ceratopsia.
Sub-"ClasII VI. Crocodilia. Orders: Pseudosuchia, Parasuchia, Eusuchia.
Sub-"ClasI VII. Plesiosauria. Orders: Nothosauri, Plesiosauri.
Sub-"Clas VIII. Ichthyosauria.
Sub-"ClasII IX. Pterosauria.
Sub-"ClasIII X. Pythonomorpha. Orders: Dolichosauri, Mosasauri.
Sub-"ClasII XI. Sauria. Orders: Lacertilia, Ophidia.
The eleven principal groups are here called "sub-classes" to emphasise the undeniable fact that these Reptilian groups are of much greater morphological value than those which are most generally called "Orders" in the Mammalia, that class which we consider as the standard or model of classificatory units.