{Vegetable sponge}. (Bot.) See {Loof}. {Velvet sponge}, a fine, soft commercial sponge ({Spongia equina}, variety {meandriniformis}) found in Florida and the West Indies. {Vitreous sponge}. See {Glass-sponge}. {Yellow sponge}, a common and valuable commercial sponge ({Spongia agaricina}, variety corlosia) found in Florida and the West Indies.