The consistency of a sponge depends on two factors--the number of spicules present, and the amount of spongin. [Please select]
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The amount of spongin present is also different in different species. [Please select]
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_mollis_ both spicules and spongin are reduced to a minimum, and the parenchyma is relatively more bulky than usual. [Please select]
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The skeleton is variable in structure, sometimes being almost amorphous, sometimes having well-defined radiating and transverse fibres firmly compacted with spongin. [Please select]
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Spicules forming triangular meshes and occasionally arranged in vertical lines several spicules broad but without spongin. [Please select]
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] _Skeleton_ reticulate but almost devoid of spongin, the reticulations close but formed mainly by single spicules; skeleton-fibres barely distinguishable. [Please select]
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There was plenty of make-believe friends hangin' on, like pilot-fish to a shark, for what they could get by spongin' on him, but real friends were scarce. [Please select]
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The fibres are composed of relatively large spicules (megascleres) arranged parallel to one another, overlapping at the ends, and bound together by means of a more or less profuse secretion of spongin. [Please select]
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