Hydraform

These polyparies, formed by the association of hydraform polypes, are among the most graceful and elegant of all the structures with which this class presents us.

Source: wiktionary

If in the hydraform and tubularian zoophytes the tentacles are prolongations of the stomach, properly so called, zoophytes, as a class, might be ranged under two leading divisions; that 1st in which the tentacles are gastric, and 2nd that in which they are perigastric prolongations.

Source: wiktionary

But as very few Medusæ have been traced from their original hydraform state, the difficulty of classifying these Hydræ still exists, and the group of specifically distinct animals is still designated by the one name, Hydra tuba.

Source: wiktionary