. A manual of zoology. Zoology. 404 ABTHBOPODA. behind this, in turn, the retina, consisting of cells which, at the one end, bear ' rods' (4 and 7), at the other joass into nerve fibres. The retina and vitreous body, surrounded by 23igment, form a B. Fig. 406.—Diagrammatic section through anterior (A) and posterior iB) eyes of Epeira diademata. (After Grenacher.) The hinder eye shows the inverted retina; i, lens; 2, vitreous Ijody ; 5, epidermis, outside this, chitinous layer ; 4, rhabdomes ; 5, retinal ceUs ; 6', capsule of eye ; 7, rhabdomes of inverted eye. spherical thickening sharply mark
. A manual of zoology. Zoology. 404 ABTHBOPODA. behind this, in turn, the retina, consisting of cells which, at the one end, bear ' rods' (4 and 7), at the other joass into nerve fibres. The retina and vitreous body, surrounded by 23igment, form a B. Fig. 406.—Diagrammatic section through anterior (A) and posterior iB) eyes of Epeira diademata. (After Grenacher.) The hinder eye shows the inverted retina; i, lens; 2, vitreous Ijody ; 5, epidermis, outside this, chitinous layer ; 4, rhabdomes ; 5, retinal ceUs ; 6', capsule of eye ; 7, rhabdomes of inverted eye. spherical thickening sharply marked off from the rest of the epi- thelium. These eyes, like those of vertebrates, must form inverted images. In many spider eyes there is an inversion recalling that of the verte- brates (flg. 406, B), the rhabdome lying beliind the nuclear portion of the cell. Behind the rhabdomes comes a layer of strongly iridescent cells, the tapetum 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
