1-Paralichthys albiguttus, 20 com. long, on fine variegated shells, yellow predominating partly buried as usually found in nature. 2-Paralichthys albiguttus, same individual two minutes later with the shells removed. 3- Paralichthys albiguttus, w1 cm long, on coarse shells of the same kind, partly buried, from August 16 to 19. 4-Same individual two minutes later with shells removed. Note that the pattern is much coarser than in figure 2 on the fine shells. In both the skin was distinctly yellowish in color..