24 SYDNEY J. HICKSON and F. H. GEAVELY. 



hydrocauli were found in the bottle. These may have formed part of the colonies 

 attached to the worm tube, and therefore our estimate of 170 mm. for the height of 

 the colony may be considerably less than it should be. 



The colonies branch irregularly and rather sparingly, and the hydrocauli are 

 polysiphonic to their distal extremities. At these extremities there appear to be four 

 to six parallel but anastomosing tubes, each of which bears a single hydranth at 

 regular intervals, and as the hydranths of the tubes arise at the same level, they 

 form a series of verticels round the hydrocaulus. 



In tracing these tubes down towards the hydrorhiza other tubes appear, which 

 creep over the primary tubes in an irregular manner and bear hydranths at less 

 regular intervals. In the lower parts of the stem (fig. 25) the secondary tubes are 

 more numerous, and play an important part in building up the substance of the 

 thick base. 



In some cases stolons in place of hydranths occur in the verticels of the primary 

 stems. These may perhaps give rise to the secondary branches. Single tubes bearing 

 hydranths and gonophores also occur climbing over polyzoa epizoic on the main 

 hydrocaulus. 



The bell-shaped hydrothecse are 0*6 mm. in length and 0*4 mm. in diameter 

 at the mouth. The pedicel of the hydranth is about 1 ' 5 mm, in length, marked 

 throughout its whole length by a spiral groove. The hydranths have 28-34 tentacles, 

 arranged in a double row, and each about ' 3 mm. in length. The gonothecse are 

 at first 0*8 X 2*5 mm. in size and pear-shaped, but later, when fertilisation has 

 been effected, become flask-shaped and 0*6 x 3 • mm. in size. .They are supported 

 by short spirally marked pedicels. 



The specimens differ from the type specimens of the species in the greater size 

 of the hydrocauli, hydranths and gonophores, in the greater regularity of and greater 

 intervals between the verticels of the hydranths, in the well-defined spiral marking 

 of the pedicels, and in the extreme tenuity of the edges of the hydrothecse, which 

 renders it impossible to determine with certainty whether the margin is or is not 

 dentate, as it is in the type. 



Although Campanularia verticillata is a common species in European waters, it 

 is not included in Hartlaub's list of Southern species (10 : pp. 505-509). 



Campanularia everta. 



Campanularia everta, Clark, Trans. Conn. Acad., III. (1876), p. 253. 



Campanularia everta, H. B. Torrey, Univ. California Public, Yol. I. (1902), pp. 51, 52, pi. iv., figs. 35-37. 



Localities.— W.Q., McMurdo Bay, February 20th and 28th, 1902 ; 20 fms. W.Q., 

 Duct, July 15th, 1902. 



This species has been previously described from the Pacific coast of N. America. 

 According to Mr. Torrey it is extremely variable (24 : pp. 51-52). 



