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Biol Bull 74: 198-210. (April 1938)
© 1938 Marine Biological Laboratory
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EMBRYONIC DETERMINATION IN THE ANNELID, SABELLARIA VULGARIS

I. THE DIFFERENTIATION OF ECTODERM AND ENDODERM WHEN SEPARATED THROUGH INDUCED EXOGASTRULATION

ALEX B. NOVIKOFF 1

1 From the Department of Zoölogy, Columbia University, and the Marine Biological Laboratory, Woods Hole, Mass.

1. A simple method for the production of complete and partial exogastruæ in Sabellaria vulgaris is described.

2. In the complete exogastruæ, no internal gut is formed. In the partial exogastruæ there is no internal oeligsophagus, but the stomach and intestine develop normally.

3. Both the ectoderm and endoderm show complete self-differentiation in the exogastruæ, indicating that one layer exercises no inducing effect upon the other between six and forty-eight hours of development, from gastrulation to the well-developed trochophore.






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