. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. THE NERVOUS SYSTEM. 181 Going higher, we find a lens introduced forming a dis- tinct image. The Snail, for example, has two simple eyes, called ocelli, mounted on the tip of its long tentacles, con- sisting of a globular lens,94 with a transparent skin (cornea) in front, and a colored membrane (ch oroid) and a ner- vous net- work (reti-. Fig. 153. — Eye of Pecten, much en- larged: w,moutn; na) behind I, lens; r, retina and choroid; n, Please note t
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. THE NERVOUS SYSTEM. 181 Going higher, we find a lens introduced forming a dis- tinct image. The Snail, for example, has two simple eyes, called ocelli, mounted on the tip of its long tentacles, con- sisting of a globular lens,94 with a transparent skin (cornea) in front, and a colored membrane (ch oroid) and a ner- vous net- work (reti-. Fig. 153. — Eye of Pecten, much en- larged: w,moutn; na) behind I, lens; r, retina and choroid; n, 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 Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
