X.iMil-HYTKS. 23 



inversion of the distal end of the gonotheca is also seen, but to a leas degree, in 

 Nutting's figures of P. profuiultt. 



The mule gonnthecie (fig. 24, <J </'/.) nro narrow and bluntly ovnte. They nre 

 not found on the same colonies as the female gonothetw. They arc 1*0 X 0*4 nun. 

 in size. 



Each of the female gonothecic contains one ovum. In P. profumln, however, 

 the gonothecae contain "a number of developing ova" (Nutting, 18: p. 67; 

 PL VIII., fig. 3). 



FAMILY GAMPANULARIIDAE. 



The character which distinguishes the hydrosomc stage of the CantpamilariicUu 

 from the Scrtulnriiilm- and Plumulnriiilaf is the presence of a stalk supporting 

 the hydrothecte and gonotheca?. It is true that in sub-family Lafoi-iiHie 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 Campanular'riJae. 



The separation of OMin and its allies from the Cnrnpaimlariidae is, perhaps, 

 an unsatisfactory feature of our classification, as there U no important difference in the 

 hydrosome stage of many of the EtM]>iJae and that of nmnv of tin- ('<tin]nuiiiliiriiiln?. 

 The Euettjiidae have, it is true, free swimming medusifonn gonophores and the 

 CampanultiriiJae have not, but, as has been shown by several authors, this distinction 

 is not one which, in the GymnMuxtea, can be used even for generic diagnoses. It 

 is certainly doubtful whether it ought to be used as a family character in the 

 CalyptMastat. 



SfB-FAMILY CAMPANULARIIXAE. 



CAMPANCLARIA VKRTICILLATA (Linn.), var, grandis. 



(Plate IV., fig. 25.) 



Sertularia vtrlieiltata, Linn ten, Syrt. Not., X. (175K), p. 811. 



CaiHjmiularia vertrillata, Hinclu, llriiish Hjdroid Zoophjtes (18C8), p. 1G7, pi. xxxii., fig. 1. 



Localities. McMurdo Bay, W.Q., February 20th, 1902 ; 20 fms. Flagon Point, 

 January, 1903; 20 fms. 



This magnificent new variety of Campanularia verticilUitn was obtained in great 

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

 McMurdo Bay, and a small specimen from Flagon Point 



llydrosoine. 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 lx>rne by the hydrocauli. In addition to the 

 specimens still attached to the worm tube an enormous number of loose broken 



