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Left: Haeckel says, "Inner medullary shell." Right: Haeckel says, "A part of the two outer shells is removed."
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Lateral view.
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Vertical section.
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Basal view.
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Haeckel says: Half the shell, with the enclosed central capsule and the phaeodium, stained by carmine. (The central nucleus dark).
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Haeckel says: Top of a pyramid.
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Haeckel says: A single triangular mesh of the lattice sphere.
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Haeckel says: The central capsule contains numerous spherical nuclei and is enclosed by the hyaline calymma, which forms conical sheaths around the spines.
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Haeckel says: Distal end of a tube.
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Haeckel says: Left- Distal part of a single radial tube, with the terminal corona. Right- apex of a six-sided pyramid, seen from the inside.
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Haeckel says: Left- A single radial tube. Right: Distal end of a single radial tube.
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Haeckel says: A single radial tube.
