240 PHYSIOLOGY AND MORPHOLOGY OF ANIMALS. 



tracts itself in any part and in any direction, putting out 

 here or there a fingerlike projection or a hairlike thread, 



and again withdrawing and 

 absorbing it into its sub- 

 stance (motion) ; or such a 

 projection may take hold of 

 some movable body, and then 



B 



Fig. 156. — Amoeba proteus (after Leicry) : A, with the pseudopods ex- 

 tended ; B, the same, with pseudopods withdrawn ; fb, food bodies ; 

 ex, excrement discharged. 



by retraction the movable body is drawn toward and 

 absorbed as food into the animal (prehension) ; or, final- 

 ly, if the point taken hold of is fixed, then the creature 

 is moved and absorbed into the fingerlike projection 

 (locomotion). 



