RU1ZOPODA. 



23 



TliP<5P o-rinnlp<s lil'o We. 10. Amoeba difflueng Jlbr. A, the 

 LllCSe granules, 1KB ] t .fr-hand figure, the most usual form; the- 



right. shows the broad, flat pseudopodia; 

 the arrows indicate the direction of circuit 



(pseudopodia) from various parts of the body, as if it 



were falling apart; then it retracts these transparent feet 



and becomes perfectly smooth and rounded, resembling a 



drop of slimy, mucous mat- 



ter. The body-mass is di- 



vided into a clear cortical and 



a medullary, granular mass ; 



the outer highly contractile, 



the inner granular portion 



acting virtually as a stock of 



fnnrl 

 1(1. 



flip (rvnino nf nnnrmin v n 

 - cmoiopnyil m 



vegetable cells and in dia- tion of the grannie*.- After ciark. 

 toms and desmids, circulate in regular, fixed currents, the 

 arrows in the figure indicating the course of the circulating 

 food. The act of circulation is probably assisted by a con- 



tractile vesicle (or 

 vacuole) usually 

 present. There is 

 besides a distinct 

 organ always pres- 

 ent, the nucleus (see 

 Fig. 11), so that the 

 Amoeba earns the 

 right to be called 

 an organism. Its 

 food consists of one- 

 celled algue, diatoms, 

 desmids, zoospores, 

 and portions of fila- 

 mentous algae, and it 

 possesses the power 

 of discrimination in 



Fig. 11. Amcft>a sjth&roroccus. A, before division. . 



7?, the same in its resting stage; a, cyst or cell-wall; taking its lOOd. Hie 

 </, body-mass; c. nucleus; 6, nucleolus. (', Ama-ba 



nearly divided. Z, two young Amoebae, the result of AmOBOa 1UIS the 1)OW- 

 divisiou. After Haeckel. 



er 01 moving in par- 



ticular directions, stretching a millimetre in length ; it 

 selects appropriate food, and can engulf or swallow, digest 

 and distribute the food thus absorbed to various portions of 



