A Text-Book of Agricultural Zoology

Cover A Text-Book of Agricultural Zoology
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— Gasteropods include the majority of univalve Mollusca. They are found in the sea, in fresh-water, and on land, The foot is in the form of a broad, flat, ventral mass, or may be in the shape of a curious fin-like organ. Gasteropods have never a bivalve shell — the shell is either univalve or multi- valve. The simplest type of shell is seen in the limpet. They are often coiled or " whorled " (fig. 173); each division of the spire or whorl may be in contact or widely separate ; the mouth is eith...er round or oval, slit-like in a few genera {Cypi-cea), and bordered by the rounded "lips." A column or piUar runs up the centre of the spiral shells, forming the columella. The body of a Gasteropod is divided into head, foot, and visceral sac; the last is enclosed in the mantle, which is never divided into two lobes as in bivalves. Most Gasteropods have an unsym- metrioal body, coiled spirally, the respiratory organs of the left side being atrophied. The flattened foot may secrete a horny or calcareous plate, the operculum, whioli serves to close the orifice of the shell when required.

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