REFERENCES TO THE PLATES. 



PLATE 51. 



Trichonympha agilis. All the figures magnified 666 diameters. 

 Figs. 1-3. Side views of three individuals, seen immediately after escaping from the intestine of 

 the Termite. The head more or less depressed within the body, and the third rank 

 of cils widely spread. The central nucleus distinctly visible. In these views the 

 animal appears broader than long. 



4. An individual as seen from above or below, with the cils extended in four chief divi- 



sions. 



5. Side view of an individual fully extended. 



6. The same individual as seen with the head rolled into a helix. 



1. Side view of an individual with the body much shortened and widened, and contain- 

 ing, besides the usual nucleus, two large, coarsely granular balls, supposed to be 

 masses of spores. 



8. Individual with the body shortened and widened and with the head enrolled into a 



helix. The nucleus apparently contained within the sunken endosarc of the head. 



9. Side view of an individual. The usual nucleus inclosed within a larger sphere. 



10, Similar view of another individual. 



11. Side view of an apparently immature individual. 



12, 13. Apparently less mature individuals, with a seemingly imbricated arrangement of 



structure, and no, visible nucleus. 

 14-20. Similar views of different individuals supposed to be immature forms of the same 



animal. 

 21. Yiew of an individual of the same kind, containing numerous spore-like bodies. 



PLATE 52. 



Figs. 1-17. Pyrsonympha vertens. All 666 diameters. 



1. Side view of a nonciliated individual in zigzag movement, together with lateral 



undulating motion of the borders in the direction of the arrows. The interior 

 nucleus visible. 



2. An individual extended, the zigzag motion retarded. The nucleus pyriform ; the 



prolongation apparently the result of change. A large quantity of food visible in 

 the broad part of the body. 



3. An individual exhibiting an extreme condition of zigzag bending. 



4. A large individual, after slackening in its zigzag motion. Several long wood-fibres 



visible in the interior. 

 5-7. Three ciliated individuals. All with the nucleus visible, and all containing som^ 

 particles of wood-fibre. 

 (446) 



