66 



Elementary Biology. 



formed by the cohesion of flagellate cells (fig. 9), or of 

 amoeboid cells (fig. 15). 



On the other hand, Metazoa may be looked upon as re- 

 sulting from the multiplication and cohesion of cells in one 

 or other or both of these latter conditions. In the multi- 

 plication of the amoeboid stage movement is usually very 

 much diminished, and is as a rule in one direction, i.e. de- 



Fin, it.- CILIATED CELLS FROM THE 

 FROG'S MOUTH. (Sharpey.) 



FIG. 12. PELLS FROM THE LINING 



OF THE LRETEK. (Kollikei.) 



finite. In most cases the amoeboid condition is represented 

 simply by the absence of the cell-wall (fig. 12). Flagellate 

 Metazoa are of common occurrence among the lower groups 



FIG. 13. Magospha-ra 

 p'.anu'.j.. (Herdman.) 



FlG. 14. MULTINUCLEATED CELL FROM 

 THE MARROW HlGHLY MAGMFIEU. 



(Schafcr.) 



of that sub-kingdom (fig. 13); whilst masses of flagellate, or, 

 if there be a number of small flagella on each cell, ciliated 

 cells occur frequently scattered here and there in the bodies 

 of the higher Metazoa (fig. n). The plasmodial condition 



