Mast, Samuel Ottmar, b.1871 · New York, J. Wiley & Sons; [etc., etc.] · leaf 187
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 united so as to form an… … 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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