Jdll. U. S. B. F., 1927, Pt. II. (Doc. 1031.) 



FiG. 14. — Amount and type of fouling. l.Balanus; 2, Bryozoa: 3, Hydroides 



Fig. 15.— Amount and type of fouling. Heavy accumulation of liydroids, tunicates, and barnacles on propeller and struts 



