Abstract
Hemocytes of two marine neritid gastropods, Nerita albicilla and Heminerita japonica, were attracted chemotactically to live Vibrio parahaernolyticus and Escherichia coli strains. Chemotactic attraction of N. albicilla hemocytes was enhanced in the presence of N.albicilla plasma, while that of H.japonica hemocytes was not enhanced in the presence of H. japonica plasma. Chemotactic activity of the hemocytes seems to participate in the rapid climination of V. parahaemolyticus from these gastropods.