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Archive image from page 387 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 376 MOLLUSCA. Fig. 190.—AnodoD dipsas. the sand or mud by means of a large, com- pressed, and nearly quadrangular foot. The posterior end of the cloak is garnished with many small tentacula. The Anodontes live in fresh waters. We have some native species ; and of the larg;est (.Mytilns qigncus, Linn.) the valves are used to skim milk. From its insipidity, the animal is not edible. M. de Lamarck distinguishes, under the name of
Archive image from page 387 of Cuvier's animal kingdom arranged. Cuvier's animal kingdom : arranged according to its organization cuviersanimalkin00cuvi Year: 1840 376 MOLLUSCA. Fig. 190.—AnodoD dipsas. the sand or mud by means of a large, com- pressed, and nearly quadrangular foot. The posterior end of the cloak is garnished with many small tentacula. The Anodontes live in fresh waters. We have some native species ; and of the larg;est (.Mytilns qigncus, Linn.) the valves are used to skim milk. From its insipidity, the animal is not edible. M. de Lamarck distinguishes, under the name of Iridina, an oblonp species, whose hinge is granu- lated its entire length. The cloak of the animal is liosed a little behind. The Dipsas of Leach is founded on another species, which has the angles more decidedly marked, and a vestige of a tooth in the hinge. The Uniones {Unio, Brug.)— Resemble the Anodontes in the shell and in the animal, but the hinge is more complicated. There is a short cavity in the anterior part of the right valve, -which receives a short plate or tooth from the left one, and behind it is a long plate, which is inserted between two others on the opposite side. They also inhabit fresh water, preferring running streams. Sometimes the anterior tooth is more or less large and unequal, as in the Mya margaritifera, Linn., whose pearls have been used in making ornaments. At other times this tooth is laminated, as in Mya pictorum, Linn., known to every body [from its shells being used in holding water colours]. (A great number of species, remarkable for their size and figure, are found in the lakes and rivers of North America. MM. Say and Barnes [and Lea] have described them, and have proposed some subgenera amongst them.) M. Delamarck distinguishes the Hyria, with the angular productions of the hinge so decided that their shell is almost triangular. And the Casfalia, the shell of which, somewhat heart-shaped, is striated with rays ; and the teeth and plates
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