noun
finely-striate buccinum; Buccinum striatissimum
A species of sea snail. The name is a taxonomic term; in everyday contexts, it may simply be referred to as a type of バイ (whelk).
エッチュウバイは日本海側で見られる巻貝の一種です。
The finely-striate buccinum is a type of sea snail found on the Sea of Japan side.
バイ is the general term for whelks or buccinum shells, while エッチュウバイ refers specifically to Buccinum striatissimum.
The name likely derives from the old province name 越中 (Etchū, present-day Toyama) and バイ (whelk), indicating a regional association. The exact origin is uncertain.