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

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.