. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. 122 BLIND VERTEBRATES AND THELR EYES. the outer nucleated layer on the dorsal and proximal parts of the eye, but since in all of the cases under consideration a good share of this space is attributable to reagents, a more detailed description is useless. However, in these regions delicate protoplasmic processes extend inward to the nucleated layer. The nuclei of the pigmented layer stain much more faintly than those of the rest of the retina with Biondi-Ehrlich, but just as deeply as the others with ha
. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. 122 BLIND VERTEBRATES AND THELR EYES. the outer nucleated layer on the dorsal and proximal parts of the eye, but since in all of the cases under consideration a good share of this space is attributable to reagents, a more detailed description is useless. However, in these regions delicate protoplasmic processes extend inward to the nucleated layer. The nuclei of the pigmented layer stain much more faintly than those of the rest of the retina with Biondi-Ehrlich, but just as deeply as the others with ha?malum. The cells of the pigment layer are in one series, but occasionally a cell is found below the level of the rest. A few cells very elongate in section may be mentioned here. They were found (fig. 41 a) on the inner face of the pigment layer. These are important in the interpretation of the structure of the eye of Troglkhthys roses, where they are also found. Their origin and significance are not Fig. 41. (a) Sagittal Section through Right Eye of Typhlichthys sublerraneus, 25 mm. long. (b) Mullerian Nuclei (?) from Retina of Individual 25 mm. long. (c) Horizontal Section of Eye of Individual 40 mm. long. Rods and Cones with their Nuclei. — While the outer nuclear layer is very well developed indeed, the rods and cones are not definite. In the most highly developed eye there is a distinct outer limiting membrane. Without this are filmy processes continuous with those from the pigment cells. Very rarely one sees an elliptical, slightly granular body which may or may not be a cone body. The outer nuclear layer is in some cases quite distinct, consisting of a compact series of outer (cone?) nuclei, irregularly elliptical in outline, below which are a few cells of a second series (rod nuclei ?) sometimes with their longer axes parallel with those of the outer layer, sometimes horizontally disposed. 1 See also Please note that these images are extracted fro
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