342 ON BRITISH RHIZOPODS AND HELIOZOA. 
EXPLANATION OF THE PLATES. 
c.v.= contractile vacuole. 
n.=nucleus. 
v.=vacuole. 
Pratt 28. 
Fig. 1. Cochliopodiwm longispinum, sp.n. 520. Active individual. 
2. Arcella artocrea, Leidy. 150. Empty shell. 
3. Gymnophrys cometa, Cienkowski. 520. 
Figs. 4, 5. Dactylospherium radiosum, Blochmann. 520, 
6-10. Cochliopodium minutum, sp.n. 520, Active individuals. 
11,12. Difflugia acuminata, Ehrenb., var. elegans, nob, Fig. 11 is a 
specimen from Wicken Fen, Cambs., with living Diatoms attached 
to the outside of the shell; 400. Fig. 12 is from Llyn-y- 
ewm-ffynon, N. Wales; 520. 
13, 14. Difflugia pyriformis, Perty. Very small forms. x 520. 
Puate 29. 
Figs. 15, 16. Centropyxis aculeata, Stein. A form from Terrington, N. Yorks, ; 
X170. Fig. 16 is a portion of the shell-membrane; 830. 
17, 18. Difflugia globulosa, Dujardin. Very small forms. 6520. 
19, 20. Quadrula trregularis, Archer. 520. 
21, 22. Hyalosphenia cuneata, Stein. 520. 
23-26. Leptochlamys ampullacea, gen. et sp.n. 520. 
Fig. 27. Pamphagus curvus, Leidy. 520. 
28. Gromia stagnalis, sp.u. 9520. 
Figs. 29-31. Vampyrella lateritia, Leidy.  X520. Fig. 29, individual with 
pseudopodia fully extended. Fig. 30, an example just attacking 
a filament of Mougeotia. Fig. 31, a third example which has 
perforated a cell of Mougeotia and partially absorbed the cell- 
contents. 
Puatre 30. 
Figs. 32, 33. Acanthocystis paludosa, sp.n. 9520. Fig. 32, active individual 
of a bright green colour. Fig. 33 is a colourless individual with 
little protoplasm and a well-marked nucleus. 
Fig. 34. Heterophrys radiata, sp.n. 620. 
35. Rhaphidiophrys pallida, F. EB. Schulze. 520. Individual 
containing chlorophyll-bodies. 
36. Actinophrys subalpina, sp. n. X9520. Individual undergoing 
division, the nucleus having completely divided. 
