12 Proceedings of the Royal Society of Victoria. 



show that they are the folds of a dividing structure seen 

 edgeways. On the other hand this may be the true thyrostonie 

 and the upper opening an ooecium with the front broken away, 

 but the appearance hardly seems to warrant this. I have seen 

 only the specimen figured, it is a very strange form. I cannot 

 refer it to any known genus, and there is nothing to show the 

 character of the zoarial growth, though it seems probable it may 

 originate from a creeping stolon like ^Etea or Liriozoa. It is 

 undoubtedly a polyzoon. 



For the information of those who may at any time examine 

 the slides of new species of Cateniceilidce described in these 

 papers (all of which will be deposited in the National Museum) 

 I would wish to point out that a few of the first slides I mounted 

 were what I may term " onmibus " slides, i.e., they contained 

 specimens of several species, and as the Catenicellidce. are so 

 minute and so fragile (I have found several have developed 

 cracks since they were mounted) that I could not attempt to 

 remount them separately, I have allowed them to remain, but 

 have removed all those which are not new to save observers the 

 trouble of hunting among numerous specimens for the types, 

 except a few to remove which would have endangered them. 



EXPLANATION OF FIGURES. 



Plates I. and II. 



Fig. 



