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“Optical section of a Radiolarian. a, Nucleus; b, wall of central capsule; c, siliceous shell within nucleus; c1, middle shell within central capsule; c2, outer shell in extra-capsular substance. Four radial spicules hold the three spherical shells together.” -Thomson, 1916


J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)


TIFF (full resolution)

1862×2400, 700.0 KiB

Large GIF

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Medium GIF

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Small GIF

248×320, 23.5 KiB