84 Rev. T. Hincks on the Reproduction of the Campanulariadse, 



ceed the external one when it has dischai'ged its contents and 

 withered away. I have never seen more than one such in the 

 same vesicle. 



The mode of reproduction which I have described is very dif- 

 ferent from that which is commonly met with amongst the Cam- 

 panulariada. No Medusoids were seen to issue from the vesicles 

 of Campanularia Syringa. Nor do the ovigerous bodies which 

 surmounted them resemble those described and figured by Lister 

 and Loven as occurring on certain species of Laomedea ; for the 

 latter assumed a true Medusan form, and tentacles were deve- 

 loped at the upper extremity. 



The vesicles of C. Syringa, on the contrary, bear a very close 

 resemblance to those which occur at times on Sertularia argentea 

 and others of the same genus, and which have been well described 

 by Sir J. G. Dalyell as " compound vesicles.^^ In the case of the 

 Sertularia, it would appear from the observations of this natu- 

 ralist, that the ovigerous body is sometimes completely developed 

 within the vesicle, and does not pass beyond it ; and so it may be 

 at times with the Campanularia, though I have not met with 

 such a case. 



Taking into consideration the facts presented by the joint 

 history of the Sertularia and Campanularia in connexion with 

 this mode of propagation, it appears that the ovigerous body is a 

 spherical expansion (bud) of the offshoot from the common ani- 

 mal substance, which penetrates the vesicle, within which the 

 ovum (or ova) is developed in a distinct central cavity, to which 

 the nutrient stream has free access; that the development is 

 sometimes perfected within the vesicle, when (in the case of the 

 Sertularia) the Planula escapes through the orifice; while at 

 others the ovigerous body passes beyond the case and remains 

 attached to it externally, still maintaining its connexion with the 

 central tube, until the ciliated ovum or Planula has reached ma- 

 turity and has liberated itself. 



There is a perfect analogy between the Campanularia and Ser- 

 tularia in respect to this method of propagation. To show the 

 close resemblance of the compound vesicle of Sertularia argentea 

 to that of C. Syringa, as just described, I have copied Sir J. G. 

 Dalyell^s figui-e of the former (PI. III. fig. 4) . The relation of this 

 mode of reproduction to that by free Medusoids I have not been 

 able to determine. 



Campanularia volubilis. 



Whilst examining specimens of C. volubilis, procured in Fe- 

 bruary, my attention was attracted by one or two very minute 

 Medusse which were jerking themselves about in the watch-glass 

 containing the zoophyte. At first I observed only one, but sub- 



