There's no definitive guide to who has designed or made the glass which was imported by J.I. Co. Some of the items can be attributed, but most cannot at this time.
It's my belief that pieces like yours were designed by J.I. Co and produced in their own Murano factory. This is based on the fact that the bird bowls, and other similarly designed bowls don't strongly resemble the work of any of the notable Murano glass houses. We know that the owner, Jack Blanco, designed much of glass, and they did have their own furnace on the island.