HYDROID ZOOPHYTES. 23 
inversion of the distal end of the gonotheca is also seen, but to a less degree, in 
Nutting’s figures of P. profunda. y 
The male gonothece (fig. 24, d gth.) are narrow and bluntly ovate. They are 
not found on the same colonies as the female gonothecse. They are 1:0 x 0°4 mm. 
in size. 
Hach of the female gonothece contains one ovum. In /. profunda, however 
b] 
ied 
the gonothece contain “‘a number of developing ova” (Nutting, 18: ps. 645 
Pl. VIIL., fig. 3). . 
FAMILY CAMPANULARIIDAE. 
The character which distinguishes the hydrosome stage of the Campanulariidac 
from the Sertulariidae and Plumulariidae is the presence of a stalk supporting 
the hydrothecee and gonothece. It is true that in sub-family Lafovinae no clear 
distinction can be drawn between the base of the theca and the stalk of the theca, 
theca and stalk forming a continuous tube, but there are other reasons for associating 
this sub-family with the Campanulariidae. 
The separation of Obelia and its allies from the Campanulariidae is, perhaps, 
an unsatisfactory feature of our classification, as there is no important difference in the 
hydrosome stage of many of the Hucopidae and that of many of the Campanulariidae. 
The Lucopidae have, it is true, free swimming medusiform gonophores and the 
Campanulariidae have not, but, as has been shown by several authors, this distinction 
is not one which, in the Gymnoblastea, can be used even for generic diagnoses. It 
is certainly doubtful whether it ought to be used as a family character in the 
Calyptoblastea. 
SUB-FAMILY CAMPANULARIINAE. 
CAMPANULARIA VERTICILLATA (Linn.), var. grandis. 
(Plate IV., fig. 25.) 
5 
€ 
(2 
Sertularia verticillata, Linneeus, Syst. Nat., X. (1758), p. 811. 
Canpanularia verticillata, Hincks, British Hydroid Zoophytes (1868), p. 167, pl. xxxii., fig. 1. 
Loealities.—McMurdo Bay, W.Q., February 20th, 1902; 20 fms. Flagon Point, 
January, 1903; 20 fms. 
This magnificent new variety of Campanularia verticillata was obtained in great 
quantities on a large brittle worm tube, 400 mm. lone by 5 mm. in diameter, from 
McMurdo Bay, and a small specimen from Flagon Point. 
Hydrosome.—The worm tube is thickly covered with a hydrorhizal plexus giving 
off at frequent intervals polysiphonic hydrocauli, which attain to a height of 170 mm. 
and a thickness of 2 mm. at the base. The hydrorhizal plexus also bears scattered 
polyps of the same type as those borne by the hydrocauli. In addition to the 
specimens still attached to the worm tube an enormous number of loose broken 
