Magnified parts of the Goose barnacle, 1787.
© Science Museum / Science & Society Picture Library
The Goose barnacle (Lepas anatifera) seen under a microscope, showing the arms or horns used for catching prey. It uses the arms to create a current of water which brings the prey to it. Figs 2 and 4 show natural size. Illustration from 'Esays on the microscope' by George Adams (1750-1795), published in London in 1787. Adams was instrument maker to King George III.