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Quarterly Journal of Microscopical Science, Vol s2-76, 209-229, Copyright © 1934 by Company of Biologists

Memoirs: Notes on the Development of the Chondrocranium of Polypterus Senegalus

J. A. MOY-THOMAS B.A.1

1 Demonstrator in Zoology, the University, Leeds

The chondrocranium of the existing specimens of the larval Polypterus have been redescribed, and the earlier specimens figured for the first time. The development of the following structures have not been described previously in Polypterus:

1. The lateral commissure which forms first from the prootic and then the post-palatine process.

2. The taenia marginales, which arise as distinct cartilages.

3. The development of the visceral arches and the temporary fusion of the first and second hypobranchials and ceratobranchials.

This development is then briefly compared with those of Scyllium, Amia, Lepidosteus, Acipenser, and Teleosts; a strong likeness being shown between it and that of Amia. The view of Goodrich is thus afforded additional support.






© The Company of Biologists Ltd 1933