珪質 けいしつ海綿 かいめんではありませんでした
keishitsukaimendewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 珪質海綿

1. Was not a siliceous sponge.; Was not a diatomaceous sponge.

Past/Perfective
Negative
Polite
Formal Register