. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. OYSTERS. 71 of these organs, one placed near the anus and the other in front of the mouth, an arrangenDent which exists in nearly all other acephala. The first tribe, in which there is but one muscle, is called Monomyaria, and the second Dimyaria. 6. To the first of these divisions belong the Oysters,— Ostrea. The shell of these mollusks is irregular, laminated, and composed of two unequal valves, united by a short ligament lodged at eiiher extremity in a pit, and the hinge is without teeth or projectincT lamina
. Elements of conchology / Prepared for the use of schools and colleges. Mollusks. OYSTERS. 71 of these organs, one placed near the anus and the other in front of the mouth, an arrangenDent which exists in nearly all other acephala. The first tribe, in which there is but one muscle, is called Monomyaria, and the second Dimyaria. 6. To the first of these divisions belong the Oysters,— Ostrea. The shell of these mollusks is irregular, laminated, and composed of two unequal valves, united by a short ligament lodged at eiiher extremity in a pit, and the hinge is without teeth or projectincT laminae. The structure of the animal itself is / g ] Fig. 89. ANATOMY OF AN OYSTER. very simple. Its mantle, the lobes of which are united above near the hinge (6), has a double fringed border : there is no appearance of foot. The adductor muscle (e) of the valves (com- monly called the heart), is situate near the centre of the body, and the heart (Z), instead of being placed as usual on the back, Explanation of Fig. 69.—Anatomy of an oyster ;—a. one of the valves of the shell;—b. the hinge ;—c. mantle of the left side;—d. portion of tho right lobe of the mantle ;—e. the muscle ;—/. the mouth;—g. the labial tentacula;—h. the liver;—i. the intestine :—j. the anus ;—k. the branchiae ; —I. the heart. 6. What are the characters of the family of Ostracea ? Where are oysters found?. 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 Ruschenberger, W. S. W. (William Samuel Waithman), 1807-1895; Comté, Achille, 1802-1866; Milne-Edwards, H. (Henri), 1800-1885. Philadelphia : Grigg & Elliot
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectmollusks, bookyear184
