Notes On British Hydroid Zoophytes And Other Subjects Polyzoan Conchological
Notes On British Hydroid Zoophytes And Other Subjects Polyzoan Conchological
Philip James Rufford
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C. Pholfcegnat. , V 1 1'' < \ - c A t jj^ l c/ ( ?tt^ jBiydklye; Shell, and its parts. Biibwing ihe Margins, Eidges, Umbones, Ligament, Linula, Ears, Accessory Plates, and the Periostracum. (All one-third nat. Size. ) THE BIVALVE SHELL. 109 PLATE XIII. The Bivalve shell, and its parts. Some of the principal lineaments of a Bivalve shell are the dorsal, ventral, anterior, and posterior margins ; pibs, ridges, and spines; the umbones; the ligament; the linula; projecting portions known as the ears ; the accessory plates ; and the periostracum. The Margins determine the contour of the valves. They are clearly shown in fig. 8. The Ribs radiate from the umbones to the anterior, posterior, and ventral margins, figs. 4, 4a, plate XIV. ; the Ridges are arranged in concentric form, and coincide with the lines of growth, they can be seen in fig. 1 ; Spines vary greatly in length, thickness, and shape, some are slender and pointed, others narrow, thin, long, flat, or, plicated, and project at various angles.
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