. The crayfish : an introduction to the study of zoology . Crayfish. THE EYE OF THE CRAYFISH. 119 to side nearly at right angles with one another. A longi- tudinal section shows that both the horizontal and the vertical contours of the cornea are very nearly semicir- cular, and that the lines which mark off the facets merely arise from a slight modification of its substance between the facets. The outer contour of each facet forms part. Fig. 28.—Astacvs flvviatilis.—A, a vertical section of the eye-stalk (X 6) ; B, a small portion of the same, showing the visual ap- paratus more highly magnifi
. The crayfish : an introduction to the study of zoology . Crayfish. THE EYE OF THE CRAYFISH. 119 to side nearly at right angles with one another. A longi- tudinal section shows that both the horizontal and the vertical contours of the cornea are very nearly semicir- cular, and that the lines which mark off the facets merely arise from a slight modification of its substance between the facets. The outer contour of each facet forms part. Fig. 28.—Astacvs flvviatilis.—A, a vertical section of the eye-stalk (X 6) ; B, a small portion of the same, showing the visual ap- paratus more highly magnified ; a, cornea ; &, outer dark zone ; c, outer white zone ; d, middle dark zone ; e, inner white zone ; /, inner dark zone ; m; crystalline cones ; g, optic ganglion ; op, optic nerve ; s/>, striated spindles. of the general curvature of the outer face of the cornea ; the inner contour sometimes exhibits a slight deviation. 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 Huxley, Thomas Henry, 1825-1895. London : Kegan Paul, Trench, Tru?bner & Co.
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Keywords: ., bookauthorhuxleyth, bookcentury1900, bookdecade1900, bookyear1906
