nUlZOPODA. 



Tlip«p o-i-flmilpa liVp Vig. W.~Ama>.ba diffluem -Ehr. A, the 

 Xliehe gldUUiet), HKC len-hand flgnre, the most usual foitn ; the 



right shows the broad, flat pseudopodia ; 

 the arrows indicate the direction of circula- 

 Af ter Claris. 



(pseudopodia) from Viirious 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 bodjr-mass is di- 

 Tided into a clear cortical and 

 a medullary, granular mass ; 

 the outer highly contractile, 

 the inner granular portion 

 acting virtually as a stock of 

 food 



the grains of chlorophyll m 

 vegetable cells and in dia- '■'™"'' '*"'s™°"'«'' 

 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. Be- 

 sides this there is a 

 head-end, as distin- 

 guished from a 

 hinder portion ; this 

 head-end is tuber- 

 culated and inter- 

 nally free from 

 granules. TheAmce- 

 ba has the power 

 of moving in partic- 

 ular directions, the head-end usually advancing first ; it 

 selects appropriate food, and can engulf or swallow, digest 

 and distribute the food thus absorbed to various portions of 



Pig. 'l\.—Amaba spJimrococms. A, before division. 

 B, the same in its resting stage; a, cypt or cell-wall; 

 d, body-mass- o, nucleus; b, nucleolus. C, Amceba 

 nearly divided. D, two young Amcebse, the result of 

 division. — After Haeckel. 



