. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ! if :' >^->. _1 ..„. .. 'r " ' ' / 8 EXPLAXATIOX OF PLATE I FIG. 5. Longitudinal section of a normal retina of Palcemonetes -I'lilf/ans in the "dark" condition. Only portions of the distal pigment cells show, due to the plane of sectioning. The reflecting pigment appears as a dense black mass above the basement membrane which is clearly visible. Below the basement membrane is the more dispersed proximal pigment. At the very bottom of the section are traces of reflecting pigment which apparently never mi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ! if :' >^->. _1 ..„. .. 'r " ' ' / 8 EXPLAXATIOX OF PLATE I FIG. 5. Longitudinal section of a normal retina of Palcemonetes -I'lilf/ans in the "dark" condition. Only portions of the distal pigment cells show, due to the plane of sectioning. The reflecting pigment appears as a dense black mass above the basement membrane which is clearly visible. Below the basement membrane is the more dispersed proximal pigment. At the very bottom of the section are traces of reflecting pigment which apparently never migrates completely above the basement membrane. FIG. 6. Longitudinal section of a normal light-adapted retina of Palamonetes. The distal pigment has migrated proximally. Immediately below the distal pig- ment is the diffuse proximal pigment which has migrated above the basement mem- brane. Below the proximal pigment is the mass of reflecting pigment from which many processes are seen extending below the basement membrane. FIG. 7. Longitudinal section of a dark-adapted Pala-monctcs retina. This specimen was injected, in the dark, with cc. of an extract of 20 light-adapted I'altcinouctcs eye-stalks in cc. of sea water. The retina was fixed 45 minutes after injection. The distal pigment has migrated proximally. The proximal pig- ment has remained below the basement membrane, while nearly all of the reflecting; pigment has moved proximally below the basement membrane. Fir,. 8. Longitudinal section of the eye-stalk of a dark-adapted Pulffinonctcs. This specimen was injected, in the dark, with cc. of extract of 4 light-adapted Libinia ilnlua eye-stalks in cc. of amphibian Ringer's solution, and was killed 35 minutes after injection. Stained with Delafield's hematoxylin and eosin. The position of the three pigments is the same as in Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - c
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
