[150] 



ORDER 



3. TESTACEA. Animals inhabiting shells, and much resembling those 



of the preceding order the barnacle, muscle, oyster, and most of 

 the animals contained in the sea shells. 



4. CRUSTACEA. Animals having almost cartilaginous bodies j and in 



some cases, with a firm incalcareous crust sea hedgehogs, sea 



stars, &e. 

 6. CORRALLIA. Polypes and other zoophites inhabiting coral branches 



and similar structures. 

 6. ZOOPHITA. Naked, plant-like animals, without any habitation* ; 



also the animalcule of infusions. 



