Murano Glass Shell Shaped Bowl from the 1960s.

I don't know the exact makers of these 1960s Murano bowls. I have been told that these were produced Fratelli Toso. However, I was then told these was was another maker who made the same shaped pieces., and I forget the name. If any one knows who the other company was, please post below. The green piece is the largest at 10" x 8". The pink piece is much smaller in the 6" range.