. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. SEA-URCHINS AND SEA-CTJOUMBERS. 289. SUCKER OF URCHIN. knob which was attached to the bottom of the saucer maintains its hold, but the tube has suddenly shrunk up to a sixth part of its former length, ex- changing at the same time its smooth slen- derness and translu- cency for a wrinkled semi-opacity. I push the knob aside with a needle's point and thus destroy its adhesion; which done, I take up the severed and shrunken sucker, and lay it in a little sea-water i
. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. SEA-URCHINS AND SEA-CTJOUMBERS. 289. SUCKER OF URCHIN. knob which was attached to the bottom of the saucer maintains its hold, but the tube has suddenly shrunk up to a sixth part of its former length, ex- changing at the same time its smooth slen- derness and translu- cency for a wrinkled semi-opacity. I push the knob aside with a needle's point and thus destroy its adhesion; which done, I take up the severed and shrunken sucker, and lay it in a little sea-water in the live-box. Under a power of 180 diameters we see that the tube is composed of two series of muscular fibres, the one set running lengthwise, the other transversely or in rings; the former by their contraction diminishing the length of the tube, the latter diminishing its calibre. The muscular walls are covered with a transparent skin, studded with round orange-coloured spots, perhaps glandular, exactly similar to those we saw on the exterior of the spines and pedicellaria. Now, to illustrate the action of these tubular feet, I must again have recourse to the de- nuded shell of a preserved Echinus. Taking this globose empty box in your hand, hold it up against the light, look- ing in at the large orifice, which was once occupied by the mouth: — you see that the whole shell is pierced with u. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gosse, Philip Henry, 1810-1888. London : Society for Promoting Christian Knowledge
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