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Colonial radiolarian, with fluid filled vacuoles within the colony. This is an example of one of the four types of large amoebae which is common in the marine water column. Image by Dave Caron
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The central capsule, enclosed originally in the shell, sends out numerous club-shaped apophyses through the pores of the lattice-sphere. The central spherical nucleus fills up half the shell cavity" Haeckel's original legend.
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Pterocanium trilobum.
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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, "The central shell-cavity encloses the spherical central capsule and the concentric nucleus."
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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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