The class Aves is most conveniently divided into two subclasses: 1.
The phenomena of the third class may be arranged in three subclasses.
The three subclasses here adopted correspond exactly with those proposed in Theo.
This is marked by the mode of reproduction, which, more nearly than in the other subclasses, resembles that of flowering plants.
The twelve totem groups are brought under four subclasses and two main classes.
On the other hand, in a temple like E-Sagila the classes and subclasses must have been very numerous.
No attempt will be made to pass in review all of the subclasses of the arachnids.
All subclasses indented under another subclass are species to the genus represented by the subclass under which they are indented.
Next to Classes and Subclasses we are to consider those groups of insects that are denominated Orders.
The primitive forms in each of these four subclasses have the fins archipterygia (see p. 127).