. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Photoreception 385 iris. Secondary and tertiary neurones are located in an optic ganglion im- mediately behind the retina, rather than on the front of the retina, as in vertebrates. Functionally as well as structurally, the eye of Se^pia is similar to that of vertebrates, except that the retinal elements are not inverted. The sixth abdominal ganglion in the crayfish is photosensitive, but the na- ture of the photoreceptor cells is unknown.^''^''* .?..^"". Please note that these images are extracted fro
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. Photoreception 385 iris. Secondary and tertiary neurones are located in an optic ganglion im- mediately behind the retina, rather than on the front of the retina, as in vertebrates. Functionally as well as structurally, the eye of Se^pia is similar to that of vertebrates, except that the retinal elements are not inverted. The sixth abdominal ganglion in the crayfish is photosensitive, but the na- ture of the photoreceptor cells is unknown.^''^''* .?..^"". 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 Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
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