みぞしじみじゃなかったです
溝蜆じゃなかったです
mizoshijimijanakattadesu

Noun
Desu Copula

The polite, past negative form of どぶしじみ

1. Wasn't a ditch clam.; Wasn't a short-necked clam.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana