PLATE LI. 



FIGS. 

 17. Lecythium hyalinum Hertwig & Lesser, (p. 105) 



Active solitary individuals; the protrusion of plasma 



as shown in Fig. 7 is due to want of air. After 



Cash, x 500. 

 8, 9. L. mutabile (Bailey) Hopk. (p. 108) Side and 



vertical views of an active individual. After Cash. 



x 500. 

 10,11. Pseudodifflugia gracilis Schlumberger. (p. 114) Side 



and vertical views of active individuals. After Cash. 



x 500. 

 12. P.fulva Archer, (p. 117) After Cash, x 500. 



