168 



small niimber of particles in suspension in the surroundino- water 

 the sponge will carry all particles captured into its amoebocytes 

 with symbiotic algae, so into its digestive organs (Fig. 71); but, 

 when the particles in suspension are very numerous, it will also 

 carry a number of them within its amoebocytes, but soon „satisfied" 

 will leave oflF, to simply eject them, directly after capturing (in or 

 near the flagellated chamber), along the shortest way at the • 

 excurrent side of the chamber, of no consideration wh ether the 

 particles are food or not (Fig. 73). 



We noiv can make the foUomnf/ diagram of the coiirse of the 

 (food-) iKirticles captured hy a fresh-water sponge (imagine the often 

 mentioned „intercellular plasmic groundsubstance" (chapt. F) in 

 the places of the arrows). The pages of the text, in which the 

 process was treated, and the figures referring to it are put in 

 parenthesis. So we begin with the capturing in the choanocytes 

 and the capturing in the plasmic layer at the outside of the 

 flagellated chamber : 



capt. plasm. Ijiyer o. flag. cliamb. 



(Fig. 72— 75j 

 1 fp. 150-54, 156, 174) 



Cfipt. choailOC. (p. 143—46, 156) 

 (Fig. 63, 65—68) 



amoeboc. w. symi). alg. (p. 146—8; 156—8). 



digestiou (Fig. 69-71) plasm. siibst. o. exc. can. wallj 



near flagell. chambers 

 defecation 



(p. 166—68; 170) 

 (Fig. 73) 



plasm. subst. o. exc. can. walls 

 defecation, exeretion 



(p. 161—66; 169—70) 

 (Fig. 76, 77) 



I now want to point out some more accidental peculiarities : 

 hK Just remember that we could stade a few times (p. 162— 

 165) that vacuoles together with feces also ejected unicellular, 

 green algae, even green symbiotic algae. I want to mention this 

 emphatically witli a view to what I said, in the part about 

 the chlorophyll of the fresh-water sponges, regarding a possible 



