HYDROID ZOOPHYTES. 25 
It was found in our collection growing on other hydroids, such as Halecium 
arboreum, and also on algee and polyzoa. It is in some cases continued beyond its 
support as a tangle of contorted tubes. 
Hydrosome.—Unbranched hydrocauli arise from the branching filiform hydrorhiza 
at intervals to a height of 2°5-10°0 mm. They are usually irregularly annulated 
above and below, and there is always one well-marked convex annulus immediately 
below the neck of the hydrotheca. According to Torrey this subthecal annulation 
constitutes the only constant character of the species (24: p. 51). 
The hydrotheca is bell-shaped and very constantly 1 mm. in length, but varies 
considerably in diameter at the distal end (0°4—0°7 mm.) as well as in outline. The 
margin is usually entire, but may be dentate. 
The material was not in a good state of preservation, but apparently the 
hydranths have about 15 tentacles about 0°6 mm. in length. 
Gonosome.—The gonothecee are pear-shaped (1°0 x 0°8 mm.) and supported by a 
spirally marked pedicel rising from the hydrorhiza. The gonophores are apparently 
female, but being badly preserved, details of their structure could not be made out. 
We have some hesitation in assigning these specimens to the species C. everta of 
Clark, as they differ in many respects from the original description of the type. But 
assuming that Mr. Torrey is correct in his statement that the species is very variable, 
and comparing our specimens with his figures and description, the course we have 
adopted appears to be a better one than that of founding for them a new specific name. 
The specimens are clearly more closely related to C. everta than to C. integra, or any 
other species of the genus. 
CAMPANULARIA LAEVIS. 
(Plate IV., fig. 26.) 
Campanularia laevis, Hartlaub, C., Zool. Jahrb., Supplement VI. (1905), p. 565. 
Localities.—W.Q., February 28th, 1902. McMurdo Bay;— 20 fms. W.Q., 
February 23rd, 1902, Flagon Point. 
Several colonies of this very beautiful hydroid were found creeping on the stems 
of Halecium arboreum. The zooids are, with the exception of those of its supporting 
species, the largest among the Calyptoblasts of the Expedition, and the large bell-shaped 
hydrothecee with toothed margins—mounted on their straight but graceful pedicels— 
are very striking. 
Hydrosome.—The creeping hydrorhiza gives rise at intervals to a number of 
straight, upright, unbranched hydrocauli from 5 to 10 mm. in height. Each 
hydrocaulus has two or three very obscure annulations at the base, and one clearly 
marked convex annulation immediately below the hydrotheca. 
The hydrotheex are bell-shaped, slightly curved at the base, and then straight, 
expanding gradually throughout their whole length. They are from 2°5-3°0 mm. in 
VOL, III, 2p 
