Abstract
1. 1. The amino acid composition of the three main hemoglobins, Hb I, Hb II and Hb III, of the hagfish ( Myxine glutinosa L.) has been determined. The composition differs so much from that of the lamprey ( Lampertra fluviatilis) hemoglobin that a diphyletic origin of the two species seems likely. 2. 2. The N-terminal residue of Hb III (hagfish) is proline as in also that of lamprey hemoglobin. The N-terminal group of Hb I and II seems to be blocked. 3. 3. Because the three main hagfish hemoglobins have different molecular weights the amino acid composition is not sufficient for a discussion of their phylogenetic interrelationship but consideration of the amino acid sequences would be necessary.
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