Mrs. Loudon’s Entertaining Naturalist

Modern System

It will be found by reading the following sketch of the Modern System that the greatest change has taken place in the latter two classes. The others remain nearly the same in effect, though their distinctions are different, and the classes are not arranged in the same order.

According to Cuvier, all animals are arranged in four great divisions, which are subdivided into classes and orders, as follows:—

Divisions	Classes	No. of Orders
I. Vertebrata. Four Classes. Twenty-seven Orders.	1. Mammalia	Nine.
	2. Aves	Six.
	3. Reptilia	Four.
	4. Pisces	Eight.
II. Mollusca. Six Classes. Fifteen Orders.	1. Cephalopoda	One.
	2. Pteropoda	One.
	3. Gasteropoda	Nine.
	4. Acephala	Two.
	5. Brachiopoda	One.
	6. Cirrhopoda	One.
III. Articulata. Four Classes. Twenty-four Orders.	1. Annelides	Three.
	2. Crustacea	Seven.
	3. Arachnida	Two.
	4. Insecta	Twelve.
IV. Radiata. Five Classes. Eleven Orders.	1. Echinodermata	Two.
	2. Entozoa	Two.
	3. Acalephæ	Two.
	4. Polypi	Three.
	5. Infusoria	Two.