. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 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
. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 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. POKES OP 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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