Osphradium
Encyclopedia
The osphradium is the olfactory organ in certain molluscs, linked with the respiration organ.
The main function of this is to test incoming water for silt
Silt
Silt is granular material of a size somewhere between sand and clay whose mineral origin is quartz and feldspar. Silt may occur as a soil or as suspended sediment in a surface water body...

 and other possible food particles.
It is used by all members of the Genus Conus
Conus
Conus is a large genus of small to large predatory sea snails, marine gastropod molluscs, with the common names of cone snails, cone shells or cones. This genus is placed in the subfamily Coninae within the family Conidae. Geologically speaking, the genus is known from the Eocene to the Recent ...

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