"the snail-like found in the internal ear, contains sensory receptors for hearing."

"The snail-like cochlea, found in the internal ear, contains sensory receptors for hearing."
The cochlea receives sound in the form of vibration causing the stereocilia to move. The stereocilia convert these movements to nerve impulses which are interpreted by the brain.

Hope this helps! :)

The zone your looking for is the intertidal zone.