SECT. 2] BIOASSAY OF TRACE SUBSTANCES 231 



Loomis, W. F., 1955. Glutathione control of the specific feeding reactions of" hydra. 



Ann. N.Y. Acad. Sci., 62 (9), 209-228. 

 Lucas, C. E., 1947. The ecological effects of external metabolites. Biol, Bev., 22, 270-295. 

 Lucas, C. E., 1955. External metabolites in the sea. Deep-Sea Res., 3, Suppl., 139-149. 

 Provasoli, L. and K. Gold, 1959. Gyrodinium cohnii, a bioassay organism for biotin and 



thiamine in sea-water. Intern. Oceanog. Cong. N.Y., 1959, 931-933. 

 Provasoli, L. and I. J. Pintner, 1953. Assay of vitamin B^ in sea-water. Proc.Soc. Proto- 



zool., 4, 10. 

 Putter, A., 1907. Der Stoffhaushalt des Meeres. Z. allgem. Physiol., 7, 321-368. 

 Vishniac, H. S., 1955. Marine mycology. Trans. N.Y. Acad. Sci., 17, 352-360. 

 Vishniac, H. S. and G. Riley, 1959. B12 and thiamine in Long Island Sound: patterns of 



distribution and ecological significance. Intern. Oceanog. Cong. N.Y., 1959, 942-944. 

 Wilson, D. P., 1954. The attractive factor in the settlement of Ophelia bicornns Savigny. 



J. Mar. Biol. Assoc. U.K., 33, 361-380. 

 Wilson, D. P., 1958. Some problems in larval ecology related to the localized distribution 



of bottom animals. Perspectives in Marine Biology, 87-99. 

 ZoBell, C. E. and H. LTpham, 1944. A list of marine bacteria including descriptions of 



sixty new species. Bull. Scripps Inst. Oceanog. Univ. Calif., 5, 239. 



