These crowded individuals of Balanus glandula have grown (on an intertidal rock) up to 10 cm tall -- Seal Beach, Oregon (USA)Source: Balanus glandula Darwin, 1854
Balanus glandula attached to a cobble at Ala Spit, Whidbey Island, Wasington (USA) - (diameter approximately 1.5-2 cm)Source: Balanus glandula Darwin, 1854