THE PRE- ADAMITE EARTH. 



Infusoria is a Latin name, implying the existence of this class 

 of animals in vegetable and other infusions, fig. 107. 



247. Since many of the names of the genera and species of 

 animals and plants would be unintelligible to a large portion of 



Fig. 136. The Holothuria. Example of the class Echinodermata. 



our readers, while a full explanation of them would be incom- 

 patible with the objects and limits of the present tract, we shall 

 generally adopt the expedient of giving a specific example of each 



Fig. 137. Polypes of the genus Asteroides. Example of the class Polyparia. 



in a parenthesis after its technical name. In many cases, how- 

 ever, even this mode of illustration is not possible, since none of 

 the species or genera of certain orders are familiar objects, and in. 

 many cases those which we shall have to mention have ceased to 

 36 



