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A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)

Brande, William Thomas, 1788-1866, Cauvin, Joseph · New York : Harper & brothers · leaf 278

An illustration from A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use, 1844, leaf 278
ngforwards from the obser-ver, is twisted from theapex downwards, from leftto right, the spire being di-rected obliquely towardsthe right (a, fig. 1. indicatesthe spiral turns ofPleuroto-ma). In certain genera, asClausilia, Physo, the shellis twisted in the oppositedirection: such shells arecalled… … CONCHOLOGY. sometimes hollow: when the latter, its aperture is termedthe umbilicus. (/. fig. 1.) The opening forming the baseof the spiral univalve is bounded by an inner lip d, and anouter lip e: the inner lip offers a smooth convex surface,over which the foot or locomotive disk of the…

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