. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. A. Right eye of a Lucifuga, 69 mm. long. The pigment layer with choroid and sclera (/, chr. & scl) is vesicular, walls of vesicle having shriveled somewhat. Section is along optic nerve (n. op.) and shows large, round pigment mass (pi. sph.) between pigment layer and lower part of retina. X 60. B. Left eye of adult, 93 mm. long. Eye has become very small, pigment layer incomplete. Very large mass of pigmented cells has accumulated over and in front of eye; strand of connective tissue (with nerve fi
. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. A. Right eye of a Lucifuga, 69 mm. long. The pigment layer with choroid and sclera (/, chr. & scl) is vesicular, walls of vesicle having shriveled somewhat. Section is along optic nerve (n. op.) and shows large, round pigment mass (pi. sph.) between pigment layer and lower part of retina. X 60. B. Left eye of adult, 93 mm. long. Eye has become very small, pigment layer incomplete. Very large mass of pigmented cells has accumulated over and in front of eye; strand of connective tissue (with nerve fibers) extends from front of eye out toward surface. X 60. C. Oblique (lower) and rectus muscles sending common tendon to eye. From fish 44 mm. 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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