In the above-given classification, the Scyphomedusae, formerly included with the Hydromedusae as Hydrozoa, are placed nearer the Anthozoa.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6" by Various
Hydromedusae, a group of invertebrate animals, the typical members of which are branched colonies of polyps: Weismann's investigations on, viii, xii.
"The Biological Problem of To-day" by Oscar Hertwig
The Hydromedusae represent, therefore, a sub-class of the Hydrozoa.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2" by Various