About fifty species are recognized at present.
I opined to keep Quinn and Martha out of the picture, at least at present.
At present, therefore, classifications of the Hydromedusae have a more or less tentative character, and are liable to revision with increased knowledge of the life-histories of these organisms. Many groups bear at present two names, the one representing the group as defined by polyp-characters, the other as defined by medusa-characters.
Corbridge was formerly of greater importance than at present.
The careful and complete collection, by Franke, of the philological evidence at present available, has raised this hypothesis into a practical certainty.
