Possible Clues:

• Jellyfish found in America by the sea
• Coelenterate seen in sea close to America
• That dame would have taken a stony stare about us
• Perseus victim
• Gorgon or jellyfish
• Snake-haired gorgon
• Snaky-haired monster
• Amused as by Gorgon
• She was hardly amused and made us petrified
• The chief of the Gorgons eventually slain by Perseus