こうろえんかわひばりかいでしょう
香櫨園川雲雀貝でしょう
kōroenkawa hibarikaideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of こうろえんかわひばりがい

1. Probably a skylark shell from Kagawa Prefecture.

Polite
Presumptive
Conjecture
Usually Written in Kana