Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 183
eeye-spot and a swerving on the spiral course in the samedirection, and this results in orientation. The larvae how-ever, having two eye-spots, can turn toward the source oflight in two positions in the spiral, whereas the Euglenaecan turn toward it in only one. If one were to imagine twoEuglenae… … i n FIG. 26. I. Arenicola larva in the free-swimming state, proceeding on a spiralcourse, m, n, directions of light; a-h, different positions on the spiral; b, dorsalsurface up, right eye-spot toward n; d, ventral surface up, left eye-spot toward n.If the ray direction is changed by simultaneously…
Light -- Physiological effect · Phototropism
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