72 STEENSTRUPIA. 
The Euphysa aurata has a smooth, inflated, globose, transparent umbrella. The orifice 
is rather contracted, and square. At each of the four angles is a large diamond-shaped 
ocellus, the upper half of which is bright golden yellow, and the lower vivid scarlet or 
crimson. From each of the ocelli springs a short, reflexed, cylindrical, yellow tentacle, which I 
have never seen to extend itself. From one of the ocelli, below the short tentacle, arises a long 
and thick one, highly extensile, and of a golden colour, usually presenting a club-like shape. The 
smaller and larger tentacles are identical in structure. A marginal vessel and veil bounds the 
opening of the umbrella. The peduncle is flask-shaped, the neck of the flask being the 
stomach, and terminating in a contracted, simple, round opening, which I never saw protruded 
beyond the disk, though often moved about in various directions ; the walls of the peduncle 
are apparently banded with motor tissue. The orifice of the stomach is tinged with 
red. The remainder is yellow, with four slightly-marked tawny bands on its lower part. 
Within the centre, and at the base of the peduncle, is a pyramidal cluster of reproductive 
cells, constituting the ovary. The size of the body scarcely exceeds one sixth of an inch. It 
is an active and lively little animal. 
Plate XIII, fig. 3, a, represents it of the natural size; 3, b, magnified; 3, ¢, is one of 
the smaller tentacles and ocellus; 3, d, the same seen in front; 3, f, the extremity of the 
larger tentacle; 3, e, the peduncle and ovaries as seen under compression. 
Genus XVII. StEENstrupta, Forbes (1846). 
Umbrella conical, apiculate ; apex connected by a cord with the sub-umbrella ; 
four marginal elongated glands opposite the four simple radiating vessels ; a single 
tentacle developed from one of the glands only; peduncle proboscidiform, with a 
simple round orifice. 
Whatever may be thought of the other genera of Sarsiadez, there can be no question 
that this is intimately related to zoophytes of the hydroid order, and is, in all probability, an 
intermediate stage. Yet animals, so singular and significant as those which I have brought 
under Steenstrupia, cannot be left unnamed until their larva or final conditions, as the case 
may prove, be determined. Nor, I trust, will the illustrious naturalist of Denmark, in honour 
of whose genius I have ventured to designate the group, disdain it, even though it prove to 
be only provisional, since whatever may become its eventual rank, in all probability the 
creatures it includes will yield valuable illustrations of the ingenious and important theory 
which he first presented in definite shape. 
Indeed several of the figures which Steenstrup has given in the first plate of his ‘ Essay 
on the Alternation of Generations,’ representing the hydroid polype Coryne fritillaria, and 
those in the first plate of Sars’s ‘ Beskrivelser, &c.’ delineating the gemmules of that 
exquisitely beautiful zoophyte, the Corymorpha nutans, bear so close a resemblance to the 
two forms of Meduse which I am about to describe, that I can scarcely doubt their close 
affinity. It is not impossible that my Steenstrupia rubra may eventually prove to be the full- 
grown medusoid of the Corymorpha,—a supposition rendered the more probable by the 
