いしだたみかいじゃなかったです
石畳貝じゃなかったです
ishidatamikaijanakattadesu

Noun
Desu Copula

The polite, past negative form of いしだたみがい

1. Wasn't a cobblestone shell.; Wasn't a paving stone shell.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana