. The Crayfish : an introduction to the study of Zoology. . Fig. 28.—Astacus Jiiiriatilis.—A, a vertical section of tlie eye-stalk (X 6) ; B, a small portion of the same, showing the visual ap- paratus more liighlj' magnified ; a, cornea ; i, outer dark zone ; c, outer white zone ; d, middle dark zone ; e, inner white zone ; /, inner dark zone ; cr, crystalline cones ; ff, optic ganglion ; oj}, optic nerve ; sj?, 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

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. The Crayfish : an introduction to the study of Zoology. . Fig. 28.—Astacus Jiiiriatilis.—A, a vertical section of tlie eye-stalk (X 6) ; B, a small portion of the same, showing the visual ap- paratus more liighlj' magnified ; a, cornea ; i, outer dark zone ; c, outer white zone ; d, middle dark zone ; e, inner white zone ; /, inner dark zone ; cr, crystalline cones ; ff, optic ganglion ; oj}, optic nerve ; sj?, 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. London

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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondon, bookyear188