. A manual of zoology. Zoology. 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
. A manual of zoology. Zoology. 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 Fig. 407.—Head of drone bee (After Sw,ammerdam, from Showing the large faceted eyes and hetweeli them three ocelli. The compound eyes are much larger. Thev owe their name ' faceted eyes' to the fact that the cuticle over them is divided into polygonal (usually hexagonal) areas or facets (fig. 407). Each. 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
