374 ALFRED GIBBS BOUENE. 



where, as over the food vacuole, marked f. v., there is only a single layer of 

 these vesicles, the green coloration is very faint. 



Fig. 5. — Portion of the periphery of an individual where there has just been 

 a slight outflow of colourless protoplasm, and which will be withdrawn without 

 the protrusion of any pseudopodium. The bacteria (? crystals) seen coming 

 out into the protruded protoplasm exhibit active (? Brownian) movements. The 

 green bodies represent the vesicles ; two of these are seen coming out into 

 the protruded protoplasm. 



Fig. 6. — View of a region precisely similar to that drawn in the preceding 

 figure, in an individual which has been treated with osmic acid. The colour- 

 less protoplasm has stained ; while the vesicular contents, now no longer 

 green, are not to be seen. It is seldom that the vesicular structure is so well 

 seen ; usually, upon the application of reagents, the vesicles seem to collapse, 

 and so no such network as is here shown can be seen. 



Fig. 7. — View of a small portion of the central region of an individual, 

 showing the same structures as in Fig. 4, with the addition of the bacteria. 

 Three nuclei are drawn with their contained nucleoli. 



Fig. 8. — A nucleus with an unusually large number of nucleoli. 



Fig. 9. — A nucleus which has been extruded with food debris, and which 

 has swollen under the action of the water, while its nucleoli have burst out. 



N.B. — Figs. 5 — 9 are drawn to about the same scale as the line A B at the 

 bottom of the plate, which represents y^qo ^^ ^'^ '\Vi(i\\. 



