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1. On the Embryology of Asteracanthion Violaceus (Linn. Sp.)

Published online by Cambridge University Press:  16 March 2015

Wyville Thomson
Wyville Thomson
Affiliation:
Professor of Natural History inQueen's College, Belfast.
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Extract

Early in December of the present winter, several specimens of Asteracanthion violaceus (L.) were procured, in the peculiar pregnant condition described by Sars. The disk was raised into a hump, and the rays drawn together at the base, to form the “marsupium” for the protection of the young. All the eggs or embryos in a single marsupium were at the same stage of development. In the least advanced, the eggs were undergoing the later stages of yelk-segmentation, while in others this process had been completed. In other individuals the embryos were partially or fully formed.

Type
Proceedings 1860-61
Information
Proceedings of the Royal Society of Edinburgh , Volume 4 , 1862 , pp. 413 - 416
Copyright
Copyright © Royal Society of Edinburgh 1862

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