The olfactory organ in a few molluscs, linked with the respiration organ. Its primary purpose should test incoming water for silt alongside feasible food particles.
The olfactory organ of some Mollusca. It's related to the organ of respiration.
The so-called olfactory organ of mollusks; a patch or region of specifically altered epithelium associated with body-wall in the foot of the ctenidium, given an unique nerve, likely to smell, flavor, or perhaps test water that the pet breathes, thus working as a unique sense-organ.