Clipart tagged: ‘siliceous shell’

"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

Radiolarian

"Optical section of a Radiolarian. a, Nucleus; b, wall of central capsule; c, siliceous shell within…

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