An Introduction to the Study of Conchology; Including Observations on the Linnaean Genera, and the Arrangement of M. Lamarck, a Glossary, and a Table

An Introduction to the Study of Conchology; Including Observations on the Linnaean Genera, and the Arrangement of M. Lamarck, a Glossary, and a Table

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1815 edition. Excerpt: ... animals have neither tube nor foot that they can protrude beyond the shell, but have two long arms to assist in swimming, ciliated on one side their whole length, which they roll up spirally within the shell when not in use, as in A. Terebratula and vitrea. The animal of A. tridentata has two flat arms somewhat scythe-shaped, and three-lobed, with which he swims in the sea. Linnaeus describes 27 species, Gmelin has added 24, and Dr. Turton none. Total, 51. But several of the species are fossil, and have not yet been found in a recent state. Lamarck has divided this genus into seven, as follow: Gryphaea. Shell with unequal valves, the lower valve concave, terminated by a beak, curved upwards and inwards, the upper valve much smaller, like an operculum; the hinge toothless, the hollow or pit oblong and arched; one muscular impression in each valve (see Anomia Grypkm, /.45). Placuna. Shell free, flat, with equal valves; the hinge with two longitudinal teeth or ribs on the interior surface of one valve diverging, or in form of a V; and on the other valve two corresponding hollows which serve for the attachment of the cartilage (see Anomia Placenta, f. 46). Anomia. Shell irregular, with unequal valves, the lower valve perforated near the beakw hich aperture is closed with a little bony operculum attached to a cartilage passing through the hole or notch, and serving to fix it to other bodies (see Anomia Ephippium, f. 47). Crania. Shell inequivalved, the lower nearly flat and round, pierced on its inner face with three unequal and oblique holes; the upper valve very convex, furnished on the interior surface with two projecting callosities (see Anomia craniolaris, Chemn. 8. t. 76. f. 687). Terebratula. Shell regular, fixed by a ligament or short tube;...show more

Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236590937
  • 9781236590930