. L'eau douce et Heliozoa Rhizopoda britannique. Rhizopoda ; Heliozoa ; animaux d'eau douce. DIFELUGIA CONSTEICTA. 57 position de ce qui est toujours excentrique ; la structure arrondie en arrière, et parfois meublé de deux ou plusieurs épines (incurvé ou droit) comme dans Gentro- pyxis. La circulaire moiith ou ovale, ses bords plus ou moins inversée, avec la lèvre antérieure proéminente. Le coloiirless test chitineuses, jaunâtre ou brune, et recouvert d'écailles irrégulières, grand et petit- mixte, ou avec des céréales ou d'autres particules étrangères. Corps-plasma, transparent, incolore ou entassés avec sma

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. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. DIFELUGIA CONSTEICTA. 57 position of which is always excentric ; the structure rounded posteriorly, and sometimes furnished with two or more spines (curved or straight) as in Gentro- pyxis. The moiith circular or oval, its edges more or less inverted, with the anterior lip prominent. The chitinous test coloiirless, yellowish, or brown, and covered with irregular scales, large and small inter- mixed, or with sand-grains or other extraneous particles. Plasma-body transparent, colourless, or crowded with small yellowish or greenish granules. Pseudopodia normal. Dimensions: Variable [; 30-125 ju, (Penard)]. In the ooze of ponds;'in marshy ground, and on 66 67. Fias. 66 AND 67.—Lateral views of Difflugia constricta. x 'dOO. moist rocks, amongst Sphagnum and other aquatic mosses; extremely common. This is one of the most variable of the JDiffiugiee, and the limits of the species are by no means well- defined. Between an example figured (PI. XIX, fig. 18), which is the largest as well as the most perfect we have met with, and the minute 8phagnum-omg forms, there is every possible gradation. Some spined varieties indeed approach so closely to Gentropi/xis aculeata in form and general structure, if not in size, as to suggest an affinity between them ; but it would hardly be safe to say that they are connected by a series of intermediate forms. The species is cosmopolitan and it is more than probable that its variable character is induced by the surrounding conditions. Ponds may be said to yield. 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 work.. Cash, James, 1839-1909; Hopkinson, John, 1844-1919. joint author; Wailes, George Herbert, 1862-. London, Printed for the Ray Scociety

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