Fig. 2. — Sizes and shapes of sessile barnacles found on ships, bottoms. 1, Balanus tintinabulum-; 2, B. crenatus; 

 provisus; 4. B. eberneus; 5, B. ampJiUrite 



-Sizes and shapes of sessile barnacles found on ships' bottoms. A cluster of B. tintinabulum 



