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. 



O O ' ' 



The male gouothecse (fig. 24, $ </'/>.) are narrow and bluntly ovate. They are 

 not found on the same colonies as the female gonotheete. They are I'O x 0'4 mm. 

 in size. 



Each of the female gouothecre contains one ovum. In ./"*. profunda, however, 

 the gonothecse contain "a number of developing ova" (Nutting, 18: p. 07; 

 PI. VIII., fig. 3). 



FAMILY CAMPANULARIIDAE. 



The character which distinguishes the hydrosomc stage of the Campanulariidae 

 from the Sertulariidae and Plnmul<irti<liu' is the presence of a stalk supporting 

 the hydrothecse and gonothecse. It is true that in sub-family Lfi>i'intte 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 Oln'li<t 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 Eucujjulae and that of many of the Campanulariidae. 

 The Eni'tipiilic 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 CAMPANULAEIINAE. 



CAMPANTJLARIA VERTICILLATA (Linn.), var. grandis. 



(Plate IV., fig. 25.) 



Sei'/ttlaria verticillata, Linnsens, Syst. Nat., X. (IT.'.s), p. sil. 



vertirillata, Hiucks, British Hydroid Zoophytes (18G8), p. 1G7, pi. xxxii., fig. 1. 



Loc,ii;t !,*. MrMurdo Bay, W.Q., February 20th, 1902; 20 fms. Flagon Pc.int, 

 January, 1903 ; 20 fms. 



This magnificent new variety of Campanularia verticillata was obtained in great 

 ijuautities on a large brittle worm tube, 400 mm. long by 5 mm. in diameter, from 

 McMurdo Bay, and a small specimen from Flagon Point. 



lli/drnxiiiiii'. The worm tube is thickly covered with a hydrorhizal plexus giving 

 off at frequent intervals polysiphouic 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 



