288 L. R. CLEVELAND. 



EXPLANATION OF PLATE i. 



FlGS. 1-7. Method of wood ingestion in Trichonympha campanula. All 

 figures X 180. 



FIG. i. Before the ingestion of food (wood). Note the particles of wood 

 adhering to the posterior surface of the body. 



FIG. 2. First stage in the process of ingescion. The longitudinal myonemes 

 (see text Fig. A) have contracted and the posterior end has thus become flattened 

 with the wood particles sticking to the outer and probably sticky surface of the 

 body. 



FIG. 3. By greater contraction of the longitudinal myonemes a cup-shaped 

 cavity is being formed by an invagination of the posterior end. 



FIG. 4. Cup-shaped cavity or temporary cytostome completely formed. 



FIG. 5. The cavity is closing by a flowing together or backward of the clear, 

 hyaline and undifferentiated portion of the body. Protoplasm in this region is 

 free to flow back and forth for a considerable distance. When very large pieces 

 of wood are ingested, it flows back around them pseudopodia-like; but this is 

 unusual. 



FIG. 6. A later stage in the closing of the cavity. 



FIG. 7. The cavity has closed and the wood particles have been ingested. 



FIG. 8. Shows the cytoplasm of the posterior end flowed backwards for a 

 considerable distance. 



FIG. 9. One Trichonympha caught in the temporary cytostome of another and 

 struggling to free itself. 



