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Quarterly Journal of Microscopical Science, Vol s2-76, 319-329, Copyright © 1934 by Company of Biologists

Memoirs: Notes on Odontosyllis

EDWIN S. GOODRICH F.R.S.

Some new features of interest are described in the excretory organs and intestine of Odontosyllis enopla Verrill, from Bermuda. The nephromixia in the genital region are formed by the combination of the nephridium and the coelomostome in such a way that the original nephridiostome preserves its structure and individuality in the fully developed organ. The coelomostome in the female is large and provided with many ciliated ridges, as in several other families of Polychaeta. The eggs in the ripe swarming female are all in the prophase of the first maturation division.

A longitudinal dorsal canal runs in the thickness of the wall of the intestine, opening behind into the rectal region. It dwindles and disappears at the anterior end of the intestine. Such a dorsal canal is present in all the species of Odontosyllis examined. A similar canal, but without openings, has recently been described by Arwidsson in the Syllid Calamyzas. In Odontosyllis the dorsal canal may carry nutritive fluid forwards, or possibly a respiratory current of sea-water from the rectal region.






© The Company of Biologists Ltd 1933