Members of which phylum are commonly known as sea walnuts or comb jellies?

Members of which phylum are commonly known as sea walnuts or comb jellies?
Members of which phylum are commonly known as sea walnuts or comb jellies?
Members of which phylum are commonly known as sea walnuts or comb jellies?
Members of which phylum are commonly known as sea walnuts or comb jellies?

jellies?