24 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Family Campanulinim;. 
Campanulina belgicoe, Hartlaub. 
Campanulina belgicx . , Hartlaub, 1904, p. 10, pi. i. figs. 8, 9. 
Idem, Vanhoffen, 1909, p. 308, fig. 28. 
Campanulina A, Hickson and Gravely, 1907, p. 31, 
Variability in the details of structure appears to be the rule in this 
form. Only about a dozen hydrothecse have been observed on a fragment 
of Sertularella cumberlandica from a single locality (a solitary stalk 
occurred at another dredging ground), yet here there are examples with 
the slightly bulging profile described by Hartlaub, and represented in 
some of the examples figured by Vanhoffen (1909, p. 308, fig. 28); and 
others with the straight, gradually widening outline of Hartlaub’s fig. 9 
(left individual), characteristic also of Hickson and Gravely ’s Campanu- 
lina A from M‘Murdo Bay. The majority have peduncles with a distinct 
spiral twist, but in some the peduncles are almost smooth, although the 
base is generally ornamented by a few annulations. Here, as in 
Vanhoffen’s specimens, there is a tendency in some of the hydrothecse, 
owing to the special development of opposite opercular flaps, for the 
operculum to bear a faint resemblance to the roof -shape typical of species 
of Stegopoma. 
The operculum has about eleven or twelve flaps. The hydranth has a 
mound-like hypostome, surrounded by tentacles which vary in number 
from twelve to seventeen. 
There was no trace of gonosome. 
Dimensions . — ■ 
Stolon, diameter .... 004 mm. 
Hydrocaulus, length . . . 0‘25-0‘49 mm. 
diameter . . . 0 , 04-0 - 07 mm. 
Hydrotheca, length, from diaphragm 0’38-0*49 mm. 
greatest diameter . 0T1-0T5 mm. 
length of operculum . 0T0-0T4 mm. 
Locality. — Growing on Sertularella cumberlandica, from Bay (east of 
Cape Royds), 7-20 fathoms, June 1908: very rare. A single stalk was 
seen on material collected in Bay, 7-8 fathoms, June 1908. 
Two smaller but badly damaged hydrothecse, with the chitinous basal 
diaphragm incompletely developed or altogether awanting, I regard as 
miniature specimens of this species. They occur upon the hydrorhiza of 
Eudendrium ramosum from M‘Murdo Sound, 25-50 fathoms, 6th July 
1908 ; very rare. 
