abalone

/ˌæbəˈloʊni/
/ˈæbəˌloʊni/

noun

An edible mollusk of warm seas, with a shallow ear-shaped shell lined with mother-of-pearl and pierced with a line of respiratory holes.

Brains of limpets and abalones are much simpler than brains of garden snails and slugs in histological differentiation.