珪質 けいしつ海綿 かいめんじゃありませんでした
keishitsukaimenjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 珪質海綿

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

Past/Perfective
Negative
Polite
Terminal Form