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In a paper, communicated to the Royal Society in March last, I described a series of Balanoglossus larvse, found by me in the Bahama Islands. The series extended from a larva with one pair of gill-slits to a form resembling in many ways a normal Tornaria; but the differences between this larva and the normal European form were so great as to induce me to believe that a process of degeneration was going on, and that the Tornaria-like creature was the oldest, not the youngest, of the series. On seeing my paper, Professor Spengel, whose researches on Balanoglossus are well known, wrote to me, informing me that I was altogether mistaken in my interpretation of the larvae which I had found, and that my series belonged in fact to the normal order of development.

XXX. Note on communication entitled 'preliminary note on a balanoglossus larva from the bahamas'