No first ranking pairs occurred at locations R 1 , R 2 ; R 1 , R7; Rb, R 6 ; or R 6, R. If we compare the observed (20:0) with expected (8.57: 11.43) ratios of con- tiguous pairs 3, 4, and 5 with contiguous pairs 1, 2, 6, and 7 (Table IV) we can conclude that the observed distribution represents a highly significant differ- ence from random (X2 = 26.67, 1 df).
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Localization of the violet and yellow receptor cells in the crayfish retinula.
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