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Updated: August 15, 2024
"The `pholas dactylus, as scientific people call it, which, until Gosse, as I said, discovered its mode of action, was quite a puzzle to every one; although, now that the mystery is out, all wonder it was not cleared up before! If you look at the head of the shell, you'll see it is provided with a regular series of little pointed spines at the end of the upper portion.
'The Pholas dactylus' he says, 'makes its hole by grating the chalk with its rasp-like valves, licking it up, when pulverised, with its foot, forcing it up through its principal or bronchial syphon, and squirting it out in oblong nodules.
The crypt protects the Pholas from confervæ, which, when they get at it, grow not merely outside, but even within the lips of the valves, preventing the action of the syphons. In the foot there is a gelatinous spring or style, which, even when taken out, has great elasticity, and which seems the mainspring of the motions of the Pholas dactylus.
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