Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 Fig. 96.—Euspongilla laciistris from quiet water and from moving water, attached to a floating thread. After Weltner. shores, Anodonta (Fig. be) and Unio alike, are small and convex, with relatively thick shells often considerably corroded at the umbo, in contrast with the large, thin-shelled, beautifully colored forms found in the quiet waters of bays. The Anodonta of Lake Constance, for instance, becom
Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 Fig. 96.—Euspongilla laciistris from quiet water and from moving water, attached to a floating thread. After Weltner. shores, Anodonta (Fig. be) and Unio alike, are small and convex, with relatively thick shells often considerably corroded at the umbo, in contrast with the large, thin-shelled, beautifully colored forms found in the quiet waters of bays. The Anodonta of Lake Constance, for instance, become 9 cm. long; those in the pond of the Waldsee in upper Wurttemberg, up to The snails of the genus Limnaea change form in the moving waters of the lake shore because of the constant pull to which their shells are exposed, which in turn produces a reac- tion on the softer parts of the body (Fig. 97). Steep shores are poor in life. The deep pedon.—The rest of the lake bottom makes up the deep pedonic region. It is not sharply marked off by biotic characteristics from the communities of the littoral region. Those parts lying nearest
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