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Haeckel says: Entire shell and central capsule. Numerous club-shaped radial apophyses or coecal sacs arise from the pink central capsule and are protruded through the pores of the medullary shell, which is completely hidden by them. The sarcomatrix in the calymma, surrounding the central capsule, exhibits a fine radial striation. Numerous retracted pseudopodia, bearing red granules, arise from the sarcomatrix and piece the calymma radially. the interval between the two concentric shells is filled up by the hyaline calymma.
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Haechel says: Medullary shell and the basal parts of the radial spines arising from it.
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Haeckel says: The central capsule and the enclosed parts of the skeleton. The protoplasm is radially striped. The central nucleus (red) sends out numerous radial apophyses, which are protruded through the pores of the medullary shell.
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Shell with vertical section through the wall.
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Tholoma metallasson.
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Haeckel says, "The central capsule (somewhat irregular by compression?) exhibits a large excentric nucleus (probably dislocated artificially?)"
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Haeckel says, "Medullary shell."
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Haeckel says, "A single radial spine."
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Haeckel says, "The central shell-cavity encloses the spherical central capsule and the concentric nucleus."
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A colonial spumellarian radiolarian, image and identification by Dave Caron. This is an example of one of the four types of large amoebae which is common in the marine water column.
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Haeckel says, "The entire inner shell, but only a small part of the outer spongy envelope is represented."
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