We have observed that the osmotic pressures of hemolymph from EA and control lobsters are indistinguishable, yet the mass of dry solids per unit volume of hemolymph in EA animals is only one-half that of controls(table2). The EA lobsters are not experiencing a simple dilution of their hemolymph. It would seem that EA animals contain a larger proportion of lower molecular weight solutes in their hemolymph than do controls and may be manipulating these solutes for the purpose of osmoregulation. It should prove instructive to examine the solute composition of hemolymph under the same conditions used in the present study.