noun
A rare species of sea snail (Pleurotomaria beyrichii). The term is uncommon and primarily used in specialist contexts.
See also: 翁戎貝
チョウジャガイは深海に生息する珍しい貝です。
The Beyrich's slit shell is a rare shellfish that lives in the deep sea.
翁戎貝 is a related slit shell species (Entemnotrochus rumphii), while チョウジャガイ refers specifically to Pleurotomaria beyrichii.
The name 長者貝 (literally 'rich person's shell') likely refers to the shell's rarity and value, but the exact derivation is uncertain.