] In the Spongillidæ the spicules and the skeleton are more important as regards the recognition of genera and species than the soft parts. [Please select]
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The skeleton is usually reticulate, but sometimes consists of a mass of spicules almost without arrangement. [Please select]
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Free spicules are absent in many species; when present they are usually needle-like and pointed at the tips. [Please select]
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The free microscleres, or flesh-spicules as they are often called, are either smooth, granular, or spiny. [Please select]
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Gemmule-spicules, which form a characteristic feature of the Spongillidæ, are very seldom absent when the gemmules are mature. [Please select]
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The simpler spicules of the Spongillidæ are formed in single cells (see fig.) [Please select]
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