The royal natural history . o have the power of moving from place to place, bycasting off the byssus, extending the footin the direction they determine to proceed,and attaching a byssal thread, whichsupports the animal while the foot isagain extended and another thread process is repeated again and again,and thus progress is made. The structureof the animal may be understood byobserving the accompanying illustration,where a represents the edge of themantle; b, the foot; c, the byssus; ,the foot - muscles; /, the mouth; g, thelabial palpi; h, mantle-lobe; and , theinner and oute
The royal natural history . o have the power of moving from place to place, bycasting off the byssus, extending the footin the direction they determine to proceed,and attaching a byssal thread, whichsupports the animal while the foot isagain extended and another thread process is repeated again and again,and thus progress is made. The structureof the animal may be understood byobserving the accompanying illustration,where a represents the edge of themantle; b, the foot; c, the byssus; ,the foot - muscles; /, the mouth; g, thelabial palpi; h, mantle-lobe; and , theinner and outer gill-plates. To the samefamily belong the date-shells (Litho-domus), which, as shown in the accom-panying illustration, are stone - shells are date-like, thin, and coveredwith a yellowish or brown boring is chiefly effected by the columns of the temple of Serapis at Puteoli are perforated by a species ofthese molluscs, at a point far above the present sea-level, thus showing that these. L COMMON MUSSEL, OPENED TO SHOW THE VARIOUS organs (nat. size).
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
