Feb., 1920] The Protozoa of Mirror Lake 127 



EXPLANATION OF PLATES. 



Plate I. 



> Heavy Lines — Outline of Water. 



Light Lines — Paths and Bridges. 

 Letters — Stations. 

 Scale — 80 feet to the inch. 



Plate IL 



(All the drawings on this plate are magnified 400 diameters). 



Fig. 1. Biomyxa vagans Leidy. An active individual. 



Figs, la and lb. Different shapes assumed by the above animal. 



Fig. 2. A smaller individual of the same species. 



Abbreviations. 



c. V. — contractile vacuole, 

 n. — nucleus. 



Plate IH. 



(All the drawings on this plate are magnified 400 diameters, except 9a, which 



is magnified 200 diameters). 



Fig. L Anisonema acinus Dujardin. An individual with the nucleus on the left 

 side of the cell. 



Fig. 2. Colpoda sp. Dorsal view of the animal. 



Fig. 2a. A ventral view of the gullet of the same animal. 



Fig. 3. Strombidinopsis sp. 



Fig. 3a. The gullet in outline. It is on the opposite side from the view of the 

 animal in Fig. 3, and can only be seen when the organism turns over. 



Fig. 4. Thuricolopsis innixa Stokes. The expanded form with numerous food 

 vacuoles. 



Fig. 4a. A view of the contracted animal. The band-like nucleus plainly visible. 



Fig. 5. Stichotricha sp. 



Fig. 6. Urocentriim turho (Muller). A pair of individuals in the act of con- 

 jugation (?) or of longitudinal division (?). 



Fig. 7. Podophrya libera Perty. Juvenile stage. 



Fig. 8. ? Outline drawing of a hypotrichous ciliate with two very long 



diagonally plaqed cilia. . 



Fig. 9. — ? A hypotrichous ciliate with one crescent-shaped meganucleus 



and two micronuclei. 



Fig. 9a. Outline of a side view of the above animal. 



Abbreviations. 



c. V. — contractile vacuole, 

 gul. — gullet, 

 f. p. — food particle, 

 megan. — meganucleus. 

 micron. — micronucleus. 

 n. — nucleus. 



