1912-13.] Hydroids of British Antarctic Expedition, 1908. 27 
Distribution . — The species has been recorded from the Arctic and North 
Atlantic Ocean — from Spitsbergen and Greenland, south to the southwards 
of the Gulf of Cadiz. But the present occurrence is very far removed from 
this area. 
Family Sertularim;. 
Sertularella cumberlandica, Jaderholm. 
Sertularella cumberlandica, Jaderholm, 1905, p. 27, pi. x. figs. 8-11; referred 
to in Yanhoffen, 1909, p. 327. 
Several dredgings revealed the presence of this species, which did not 
occur in the Discovery collections. The finest colony was obtained between 
Fig. 7. — Part of branch of Sertularella cumberlandica , with abnormal 
free hydro theca, x 50. 
10 and 20 fathoms in the Bay — a straggling individual with stout fascicled 
stem T5 mm. in thickness at the base, and 5 cm. high, although it is in- 
complete. The stem bears numerous long, straggling branches, one 7 cm. 
in length, which exhibit an arrangement approximating to alternate. These 
primary branches, which are fascicled for a great part, bear many smaller 
monosiphonic branchlets, but it is seldom that individuals of tertiary degree 
occur. The expanse of this colony from side to side is about 10 cm. 
There is nothing to be added to Jaderholm ’s description of the detailed 
characters of the species. 
A curious abnormality occurs on several of the branches — where, from 
beneath a hydrotheca on the anterior of the branch, a second hydrotheca 
arises exactly in the position usually occupied by a gonangium (fig. 7). 
This abnormal hydrotheca is quite free, except for the narrow neck which 
