17 



PLATE IX. 



PROTEUS ANIMALCULE. 



STRUCTURE 



FIG. 1. Ectosarc or outer transparent border (Gr. ektos, outside ; sarx, flesh). 

 Endosarc or inner granular portion (Gr. endon, within). 

 Contractile vesicle or vacuole, a cavity filled with a clear fluid. 

 Nucleus or endoplast, a roundish solid granular portion of protoplasm. 



Pseudopodia (Gr. pseudos, false ; pous, podos, a foot), processes of the body constantly changing. 

 MOVEMENTS 



Fio. 2. Changes of form constantly taking place, hence the name of Proteus Animalcule. 



Food-particles. 

 MULTIPLICATION 



FIG. 3, . Stationary form surrounded by a structureless case or cyst. 



b. Mobile form escaped from cyst. 



c. Process of fission taking place. 



d. Original amoeba divided into two. 

 CLASSIFICATION Structural relations with other animals. 



Kingdom Auimalia, because it depends on pre-formed protoplasm and docs not possess a 



cellulose cell-wall. 

 Sub-Kingdom Protozoa (Gr. prolos, first; won, an animal), because it is not differentiated into 



cells. 

 Natural Order Protoplasta (Gr. i>lastos, moulded), because it possesses a nucleus and contractile 



vesicle. 



Genus Ameeba (Gr. amoibe, change). 

 Common Name Proteus Animalcule. 



COLOURLESS CORPUSCLES OF HUMAN 



BLOOD. 



FIG. 4, a. Structure granular with spherical or irregular outline. 



b. Nucleus brought out with dilute acetic acid. 



c. Amoeboid movements taking place sluggishly. 



