THE PHYSIOLOGY OF EXCRETION. 



95 



the food in the funnel cell body is carried into B y and recon- 

 structs with C-W" the original ciliary substance C. The 

 waste product W" is discharged and carried away into the 

 receptaculum. 



In the excretophore E we find the following given factors : 



FIG. 6. 



W= the excretory granules picked up by the cell during its 

 wandering, and N= nutritious substances composed of plasma 

 P and the often-mentioned isolating drops 7. The secretion or 

 waste product W from the funnel cell body A influences the 

 excretophore E so that the latter disintegrates. During this 

 process W reacts on N, and as a result of this chemical process 

 we get N r = fluid nutritious substances, which are possibly used 

 up by the surrounding tissues. O= free oxygen, which is 



