The crown containing the viscera of crinoids and similar echinoderms, entoprocts, and the polyps of some cnidarians.
A chamber in the mammalian kidney through which urine passes.
The outermost whorl of flower parts, comprising the sepals, which covers and protects the petals as they develop.
A flattened cap of neuropil in the brain of insects.
A funnel-shaped expansion of the vas deferens or oviduct of insects.
The body cavity of a coelenterate.