Abstract
1. 1. The oxygen equilibria of vascular and coelomic hemoglobins of the terebellid polychaete, Pista pacifica, have been investigated. 2. 2. The effects of hemoglobin concentration, temperature, pH and concentration of specific ions on the oxygen affinity and shape of the dissociation curves have been studied. 3. 3. Under all conditions examined, the coelomic cell hemoglobins have a higher oxygen affinity than the vascular hemoglobin, suggesting an oxygen transfer system from the branchial gills to the vascular hemoglobin and then to the coelomic cell hemoglobins. 4. 4. The oxygen equilibrium properties of these pigments are compared with those of other hemoglobins under similar conditions.
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