The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . heir thin and moderately ventricose shell has no tooth in the hinge, but merely a liga-ment occupying its entire length. The animal {Limncea, Poli) is without a byssus; and it creeps over t The means \)j which the bivnlrcd Mollusca perforaterocks has ^ven rise to much discussion : some believe that tliey dt;the wiirl< by the mechaniciil action uf the valves ; others attribute itto a solvent secreted by the animal. Ail things , I thii
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . heir thin and moderately ventricose shell has no tooth in the hinge, but merely a liga-ment occupying its entire length. The animal {Limncea, Poli) is without a byssus; and it creeps over t The means \)j which the bivnlrcd Mollusca perforaterocks has ^ven rise to much discussion : some believe that tliey dt;the wiirl< by the mechaniciil action uf the valves ; others attribute itto a solvent secreted by the animal. Ail things , I ;the first of these oidnions, notwilhstanding the dithculliis in the its adoption, is yet the most iirobablc. • We cannot imagine, says Sowerby, that this remark h lic-n made /rom actual observation, because ve be! eve it to be co to the nature of the animal to be at o ne tin e attached by liyssus, and not at another; and, moreover, »e hai e ourselves sec l„thoil<imi not more than one-eighth of an ii ch in ength, in as CO, plctety-formed proportions as tlie fuller-grow a spec ,nens.—Ed. 37 G Tig. 190.—Anudon dip the sand or mud by means of a large, com-pressed, and nearly quadrangular foot. Theposterior end of the cloak is garnished withmany small tentacula. The Anodontes live infresh waters. We have some native species ; and of tlie larg;est(Mytilus cygneus, Linn.) the valves are used to skimmilk. From its insipidity, the animal is not edible. M. de Lamarck distinguishes, under the name ofIridina, an oblono: species, whose hinge is granu-lated its entire length. The cloak of the animal isclosed a little behind.* Tlie Dipsas of Leach isfounded on another species, which has the anglesmore decidedly marked, and a vestige of a tooth inthe hinge. The Uniones {Unto, Brug.)—Resemble the Anodontes in the shell and in theanimal, but the hinge is more complicated. Thereis a short cavity in the anterior part of the right valve, which receives
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
