When Cambarus clarkii is exposed to a source of light so that both eyes are equally illuminated, leg movements of the two sides are equal in frequency and amplitude. On covering one eye and exposing the uncovered eye to light, leg movements on the side of the uncovered eye are more frequent and are of greater amplitude than on the side of the covered eye.… (More)
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Computations of the effective angular inclination (H) of the photoreceptive surfaces of the two sides, based upon measurements of orientation angles under the action of beams of light directly opposed or crossing at right angles, show that with larvae of Calliphora and of Lucillia H declines as the total illumination decreases (i.e., as the angle of… (More)
On an inclined surface the fiddler crab Uca pugnax, during sidewise progression, orients upward through an angle theta on the surface. The extent of negatively geotropic orientation (theta) is a rectilinear function of sin alpha, where alpha is the inclination of the surface to the horizontal. This equation differs from that describing the geotropic… (More)