PLATE XVIII. 



FIGS. 



1-3. Difflugia crassa Cash. (p. 13) Figs. 1, 2. Two indi- 

 viduals, each with three protuberances, but diffe- 

 rently disposed. Fig. 3. Dorsal view of fig. 1. 

 Pond at Chipperfield, Herts, x 160. 



4-6. D. Penardi Hopk. (p. 14) Fig. 4. Living example 

 from a pond at Baguley, Cheshire. Figs. 5, 6. 

 Empty tests found in Sphagnum from Towyn, N. 

 Wales, x 280. 



7, 8. (?) D. pulex Penard. (p. 16) Empty test and living 

 example in Sphagnum from Dolgoch, near Towyn. 

 x 280. 



9-11. D. pristis Penard. (p. 18) Fig. 9. Empty test 

 slightly tilted to show mouth. Figs. 10, 11. Dorsal 

 and lateral views of a living individual. Hill Cliff, 

 Cheshire, x 260. 



12, 13. D. acuminata Ehrenb. (p. 19) Forms showing ex- 

 tremes of variation. Fig. 12. From Northenden. 

 Fig. 13. From Park Bridge, Ashton-under-Lyne. 

 x 280. 



14. D. acuminata var. inflata Penard. (p. 23) From 

 Sychnant Pass near Conway, N. Wales, 1907. x 280. 



