. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. 45 spread out and connect with the nerve cells of the ganglionic layer in the usual manner. The Retina.—While the retina has undergone considerable change, all of the layers are still present (fig. 15 a). It measures 78 /x in thickness. In Anolis about half-way between the anterior and posterior parts of the eye it is 179 fj- in thickness. If the macula lutea is still present, the preparations do not show it. The Pigment Layer. -- The pigment layer (1, fig. 14), which bounds the retina ext
. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. 45 spread out and connect with the nerve cells of the ganglionic layer in the usual manner. The Retina.—While the retina has undergone considerable change, all of the layers are still present (fig. 15 a). It measures 78 /x in thickness. In Anolis about half-way between the anterior and posterior parts of the eye it is 179 fj- in thickness. If the macula lutea is still present, the preparations do not show it. The Pigment Layer. -- The pigment layer (1, fig. 14), which bounds the retina externally, consists of a single stratum of rectangular cells separated by a small amount of clear intercellular substance. These cells have large oval nuclei free from pigment, almost transparent and with small nucleoli. At the back part of the eye, where the pigment layer measures 8 fx, the transverse diameter of the cells. 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 Eigenmann, Carl H. , 1863-1927. Washington, D. C. , Carnegie Institution of Washington
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