. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 204 K. R. JOHN, M. SEGALL AND L. ZAWATSKY TABLE 11 Mean RP values of single cones during the first 24 hours in darkness, based upon radial sections. Sunset was at 2036 hr. and the expected sunrise was 0534 hr. Plus and minus values represent one standard deviation. The p values are based upon Student's t-test between successive time periods Groups Time Number of fish RP value P A, E, F 2100 o ± 2200 6 ± > .01 2300 6 ± n. s. 2400 6 ± > .05 0100 5 ± n. s. 0200 4 ± n.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 204 K. R. JOHN, M. SEGALL AND L. ZAWATSKY TABLE 11 Mean RP values of single cones during the first 24 hours in darkness, based upon radial sections. Sunset was at 2036 hr. and the expected sunrise was 0534 hr. Plus and minus values represent one standard deviation. The p values are based upon Student's t-test between successive time periods Groups Time Number of fish RP value P A, E, F 2100 o ± 2200 6 ± > .01 2300 6 ± n. s. 2400 6 ± > .05 0100 5 ± n. s. 0200 4 ± n. s. 0300 8 ± > .01 0400 7 ± n. s. 0500 6 ± > .05 A only 0534 4 ± n. s. 0800 i ± n. s. 1100 3 ± > .05 1300 4 ± n. s. 1500 4 ± n. s. 1800 4 ± n. s. 2037 4 ± n. s. of the curve between 0300 hr. and 0400 hr. The slope of the curve in that interval for group F was negative. The single cones showed a greater photomechanical shift than the double cones. The photomicrographs in Figure 3 show that the distal margins of the ellipsoids of single cones were nearer the ELM in the 1300 hr. retina and farther from the ELM in the 0100 hr. retina than the double cones. The relative fluctuations be- tween points in the graphs of single and double cones were about equal (Figs. 1 and 2), but the single and double cones may have shown some independent behavior. 70 - UJ Q. tr 30 H. I 5 I 17 29 I 41 53 I 65 HOURS IN DD FIGURE 4. Rhythmic shift of positions of double cones based upon serial tangential sections. Group Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray,
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