. The British freshwater Rhizopoda and Heliozoa. PLATE XT/. 7/ . *\ ^\\^^^x /^ J. Cash 4e. , im|)r. Plate 15 PLATE XV. Fias. 1-3. Arcella vulgaris Ehrenb. (p. 118) Pond, 300. Fig. 1.—A young individual, in activemovement, with transparent test. Figs. 2 and 3.—Empty tests of the same (p. 122) Pond, Cheshire, x 4 and 5.—Lateral and dorsal views of livingindividuals. Fig. 6.—A young individual withimperfectly-formed , 8. A. dentata Ehrenb. (p. 125) Dorsal and lateralviews, showing character of test, x , 10. A. mitrataheidj. (p.

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. The British freshwater Rhizopoda and Heliozoa. PLATE XT/. 7/ . *\ ^\\^^^x /^ J. Cash 4e. , im|)r. Plate 15 PLATE XV. Fias. 1-3. Arcella vulgaris Ehrenb. (p. 118) Pond, 300. Fig. 1.—A young individual, in activemovement, with transparent test. Figs. 2 and 3.—Empty tests of the same (p. 122) Pond, Cheshire, x 4 and 5.—Lateral and dorsal views of livingindividuals. Fig. 6.—A young individual withimperfectly-formed , 8. A. dentata Ehrenb. (p. 125) Dorsal and lateralviews, showing character of test, x , 10. A. mitrataheidj. (p. 124) Dorsal and lateral views,after Leidy. x about 800. 11, 17. A. vulgaris v& (Penard) G. S. West. (p. 121) A small variety, with facetted test. Frequent inponds. X 300. 12, 16. A. vulgaris var. angulosa (Perty) Leidy. (p. 121) In outline, after Leidy. x A. vulgaris. Figs. 13 and 14.—Dorsal and lateralviews of a young individual; the test transparent,with dilated base. Fig. 15.—A remarkably finevariety, with pitted test. Pond at Park Bridge,Lancash

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