Chapter III: PHYSOPHORIDA (Physonectae + Auronectae, Haeckel). With an

apical pneumatophore, not divided into chambers, followed by a series of nectocalyces or bracts.

A great number of families and genera are referred to this group,
amongst which may be mentioned specially--(1) _Agalmidae_, containing
the genera _Stephanomia_, _Agalma_, _Anthemodes_, _Halistemma_, &c.;
(2) _Apolemidae_, with the genus _Apolemia_ and its allies; (3)
_Forskaliidae_, with _Forskalia_ and allied forms; (4)
_Physophoridae_, for _Physophora_ (fig. 73) and other genera, (5)
_Anthophysidae_, for _Anthophysa_, _Athorybia_, &c.; and lastly the
two families (6) _Rhodalidae_ and (7) _Stephalidae_ (fig. 74),
constituting the group Auronectae of Haeckel. The Auronectae are
peculiar deep-sea forms, little known except from Haeckel's
descriptions, in which the large pneumatophore has a peculiar duct,
termed the aurophore, placed on its lower side in the midst of a
circle of swimming-bells.