17 



PLATE IX. 



PROTEUS ANIMALCULE. 



Structure — 



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

 EnJosarc 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. -pscudos, false ; 2^ous, podos, a foot), processes of the body constantly clianging. 

 Movements — 



Fig. 2. Changes of form constantly taking place, hence the name of Proteus Animalcvde. 

 Food-particles. 

 Multiplication — 



Fig. 3, a. Stationary form surrounded by a stractureless case or cyst. 



b. Mobile form escaped from cyst. 



c. Process of fission taking place. 



d. Original amceba divided into two. 

 Classification — Structural relations with other animals. 



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



cellulose cell-wall. 

 Siih-Eingdom — Protozoa (Gr. protos, first ; zoon, an animal), because it is not differentiated into 



cells. 

 Natural Order — Protoplasta (Gr. plastos, moulded), because it possesses a nucleus and contractile 



vesicle. 

 Genus — Amoeba (Gr. amoihe, change). 

 Common Name — Proteus Animalcule. 



COLOURLESS CORPUSCLES OP HUMAN 



BLOOD. 



Fig. 4, dr. Structure — granular with spherical or irregular outline. 



h. JS'ucleus brought out with dilute acetic acid. 

 I c. Amoeboid movements taking place sluggishly. 



