Further experiments on adventitious reproduction and polarity in harenactis

TLDR: The pieces of the actinian, Harenactis attenuata, which form "rings" by the union of oral and aboral ends about the whole circumference, after more or less complete removal of mesenterie and mesenterial muscles, may produce new discs with radially arranged new mesenteries and tentacles and mouth-opening and esophagus.

Abstract: 1. The pieces of the actinian, Harenactis attenuata, which form "rings" by the union of oral and aboral ends about the whole circumference, after more or less complete removal of mesenteries and mesenterial muscles, may produce new discs with radially arranged new mesenteries and tentacles and mouth-opening and esophagus. Thus far the usual number of tentacles, twenty-four, has not been attained in any case, the largest number being sixteen. Such discs with from three to eight tentacles are of frequent occurrence, but the formation of mouth and esophagus has been observed only once. After the formation of the discs they may be gradually elevated from the surface of the rings by the development of a cylindrical column beneath them.In addition to the well-developed discs, radially as well as bilaterally symmetrical and asymmetrical tentacle groups may arise along the line of union on either side, or the tissue of both sides may take part in the formation of a single group.2. These further experiments with r...