A highly organized mollusc without an external shell, and sometimes of great size. Its head has large staring eyes, and its eight arms or feet have two rows of suckers, which adhere to animals or objects by a curious mouth with two long teeth. Within its body is a sac with an inky fluid, which it throws from a funnel in its mouth when alarmed. This ink is used as sepia, or India ink. The name devil-fish is sometimes applied to the fishing-frog, and in America to a gigantic species of ray, one of which has been found in Delaware Bay weighing 5 tons.