] It will be noted that the diagram represents an individual with a single osculum or exhalent aperture. [Please select]
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Of the more important soft structures in the sponge the osculum is the first to appear, the ciliated chambers being formed later. [Please select]
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They are never more than about a quarter of an inch in diameter and never possess more than one osculum. [Please select]
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The simplest form of sponge, which is known as an olynthus, is a hollow vase-like body fixed at one end to some solid object, and with an opening called the osculum at the other. [Please select]
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