. Evenings at the microscope : or, researches among the minuter organs and forms of animal life. Microscopy; Microscopes; Medical microscopy. BPIDEBS AND MITES. 239 afford good characters by -whicli naturalists have grouped them in genera. In the Clubiona which we have been examining, they are placed in two nearly straight transverse rows on the forehead ; but as this sui-face is convex, it follows that the axis of every eye points in a different direction from that of its fellows. In Epeira, on the other hand,—represented by our great Garden Spider so commonly seen in the centre. EYE OF SPIDE
. Evenings at the microscope : or, researches among the minuter organs and forms of animal life. Microscopy; Microscopes; Medical microscopy. BPIDEBS AND MITES. 239 afford good characters by -whicli naturalists have grouped them in genera. In the Clubiona which we have been examining, they are placed in two nearly straight transverse rows on the forehead ; but as this sui-face is convex, it follows that the axis of every eye points in a different direction from that of its fellows. In Epeira, on the other hand,—represented by our great Garden Spider so commonly seen in the centre. EYE OF SPIDER. of its perpendicular web, on shrubs and in comers of our gardens,—the four middle eyes form a square, and the two lateral ones on each side are placed in contact with each other. It is interesting to remark that their arrangement is not arbitary, but is ancillary to the varying instincts and wants of the different kinds. On this subject I will quote to you what Professor Owen says :—" The position of the four median ones is the most constant; they generally indicate a square or trapezium, and may be compared with the median ocelli in hexapod insects. The two, or the two pairs of lateral ocelli may be com-. 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 Gosse, Philip Henry, 1810-1888. New York, D. Appleton
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