みぞしじみでわありませんでした
溝蜆ではありませんでした
mizoshijimidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of どぶしじみ

1. Was not a clam.; Was not a groove/ditch clam.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana