PLATE XXI. 



Figs. 

 1, 2. Difflugia acuminata var. curvata Cash. (p. 24) Two 



forms from pond at Chipperfield^ Herts. x 160. 

 3, 4. D. lucida Penard. (p. 32) Broad and narrow views 

 of an empty test. In Sphagnum from Towyn^ IST. 

 Wales. X 280. 

 5-9. D. globulus (Ehrenb.) Hopk. (p. 33) Examples 

 showing variation in size and form ; from various 

 localities, x 280. 

 10-12. D. tirceolata Carter. (p. 39) Fig. 10.— A living 

 example with a single protuberance. Richmond 

 Park, Surrey. Pig. 11. — A typical form from Rich- 

 mond Park. Fig 12. — A form convex at the mouth. 

 Pond at Chipperfield. x 280. 

 18. D. amphoralis Hopk. (p. 48) In Sphagnum from 

 Criccieth, N. Wales, x 280. 

 14-17. D. lobostoma Leidy. (p. 44) Figs. 14^ 15. — Living 

 examples from ponds near Manchester. Figs. 16, 

 17. — Empty tests showing four-lobed and six-lobed 

 mouths. Richmond Park, Surrey, x 280. 



