. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 26 BRITISH TBESHWATEIi EHIZOPODA. described by Dr. Gr. S. "West in the ' Journal of the Linnean Society' on account of its having the test broad and symmetrical (though the coronal horn is deflected) and its anterior part without constriction. It has peculiarities, however, in the clear chitinous and homogeneous test and the absence of minute diatoms such as Perty represents adhering to it; but there is nothing in these characters which may not be accounted for by environment. In the swamp at Dunham,
. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. 26 BRITISH TBESHWATEIi EHIZOPODA. described by Dr. Gr. S. "West in the ' Journal of the Linnean Society' on account of its having the test broad and symmetrical (though the coronal horn is deflected) and its anterior part without constriction. It has peculiarities, however, in the clear chitinous and homogeneous test and the absence of minute diatoms such as Perty represents adhering to it; but there is nothing in these characters which may not be accounted for by environment. In the swamp at Dunham, Cheshire, we have met with a form not unlike West's, but with an erect rounded protuberance. Fia. 45.—Difflugia haciUariarum. After Perty, loc. cit. x about 280. on the crown instead of a tubular horn—a fact which, no less than its general variability, leads us to doubt whether the posterior perforation—when present —plays any practical part in the economy of the organism. If it did we might expect it to be an unvarying feature. West describes the form which he discovered in Wales as possessing a pale yellow test, through which the protoplasm was distinctly visible; its body had scattered sand-grains attached, comparatively large, and similar grains agglomerated about the mouth. In the ' Journal of the Linnean Society (Zool.),' vol. xxix, p. 113, the author correlated this form with Difflugia Solowetzhii Meresch., and gave another locality for it—in Sutherlandshire. The figure of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cash, James, 1839-1909; Hopkinson, John, 1844-1919. joint author; Wailes, George Herbert, 1862-. London, Printed for the Ray Scociety
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