EEPOET ON THE HYHEOIDA. 
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Calamphora parvula, n. sp. (PL X. figs. 8, 3a). 
Trophosome. — Hyclrocaulus a narrow, creeping, adherent tube, to which the hydrothecas 
are attached at short intervals by very short, almost evanescent, peduncles. Hydrothecse 
with very regular closely set annular ridges, and contracted distally into a short neck 
which terminates in a tetragonal orifice, and is directed towards one side so as to form an 
obtuse angle with the axis of the hydrotheca. 
Gonosome. — Gonangia oviform, considerably larger than the hydrothecse, regularly 
and distinctly annulatecl throughout, subsessile on the creeping tube from which each 
springs close to the origin of a hydrotheca, and opening on the summit by a circular 
four-toothed orifice. 
Locality. — Station 162, off East Moncoeur Island, Bass Strait; depth, 38 fathoms. 
This beautiful little species, which scarcely attains a height of one-fortieth of an inch, 
occurred in abundance creeping over specimens of Dictyocladium dichotomum. The 
hydrothecse are rendered bilateral by the direction of the neck towards one side, while 
the tetragonal orifice and regular annulation of their walls contribute still further to 
the singularity and elegance of their form. This distinct annulation of the walls of the 
hydrothecse, as distinguished from mere strise indicative of successive elongations in 
growth, is indeed a character in the highest degree exceptional among the Campanu- 
larians. An instance of it occurs in Hebella striata, ooe of the species dredged by 
the Challenger, and in Lafo'ea ( Hebella ) venusta, a species obtained during the United 
States’ exploration of the Gulf Stream. In Llebella striata, however, the annulation 
is very much more delicate than in Calamphora parmda. The gonangium in 
Calamphora parvula is also annulated in a manner quite similar to that of the 
hydrothecse. The annulation of the gonangium. however, is of frequent occurrence 
among the Campanularian and Sertularian Hydroids. 
Hebella, n. gen. 
Name, from Hebe, the cup-bearer of classical mythology. 
Generic Character. Trophosome. — Hydrocaulus a creeping monosiphonic stolon. 
Hydrothecse cylindrical, with entire margin, destitute of operculum, and with the cavity 
distinctly differentiated from that of the peduncle. 
Gonosome not known. 
The genus Hebella includes a number of minute Hydroids with cylindrical cup-shaped 
hydrothecse. Most of these have been arranged by Hincks under the genus Lafoea. 
From this genus, however, as here limited, they differ in their monosiphonic hydrocaulus, 
and in the distinct differentiation of the hydrothecal cavity from the cavity of the 
peduncle. From Campanularia and its immediate allies Hebella is distinguished by 
