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1 Woods Hole Oceanographic Institution, Woods Hole, Mass.
2 The College, University of Chicago, Chicago 37, Illinois
1. Three models suggested to account for the ability of arthropods to detect the plane of linear polarized light are characterized.
2. Measurements of polarized light refracted through the cone lens of Daphnia pulex are summarized.
3. These measurements are compared with calculated intensities derived from one of the three models.
4. The shape of the cone lens of Daphnia and the specialization of their contours for polarization analysis are suggested.
5. The operation of the various models in nature is criticized.
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