Assertion: sponge's cavity | /r/HasProperty | the atrium
Facets:
Source sentences:
text: A hexactinellid possesses a cavernous central cavity (the atrium) through which water passes; a cap of tightly woven spicules covers the osculum in some species.
text: The walls of the pharynx are perforated by several bands of slits, known as stigmata, through which water escapes into the surrounding water-filled cavity, the atrium.