Bull. U. S. B. F., 1927, Ft. II. (Doc. 1031.) 



Fill. IS— Type and amount of fouling on ships' bottoms. Large clusters of tunicates (sea squirts) 



Fig. 19.— Tj'pe and amount of fouling on ships' bottoms. Numerous tunicates, typical clusters of hydroids, many small 

 barnacles, and colonies of Bryozoa 



