Mr. A. W. Waters on the term <l Bryozoa." 157 



suppose, in any way confined to Heteropora, but is a general 

 characteristic of the Cyclostomatous Bryozoa. Shortly after 

 the publication of my paper, Mr. Busk published an interesting- 

 account, with figures, of a species from New Zealand, to which 

 Professor Nicholson refers in the book in question. Mr. Busk 

 here gave a description of the species, and took it for granted 

 that the genus was understood to be Bryozoan. 



I may allude to another point, by way of caution. I was 

 first led to study Heteropora by seeing, in the species I first 

 had under observation, a deceptive appearance which I sup- 

 posed, until I made sections, was due to transverse dissepiments. 

 In recent species, in specimens from the Crag, from the Chalk 

 of Belgium and France, and the Jurassic of Switzerland, I 

 have been similarly misled, as when I have prepared sections 

 I have never found any thing like septa ; but M. J. Haime 

 and Mr. Busk have both found these dissepiments ; and 

 Mr. Busk, in consequence of my remarks, confirms his previ- 

 ous observations. It will, however, be seen that great care 

 is required ; and it will be satisfactory if authors will say how 

 the examination was made when they describe this structure 

 in new species. 



Professor Ehrenberg also called some true corals Heteropora) 

 but the genus has not been retained, and should not cause 

 any confusion with the well-known genus of Bryozoa. There 

 is at present great confusion regarding the group of allied Bryo- 

 zoa which we may have to call the Heteroporidte, with which 

 many forms described by D'Orbigny under his group Clausa 

 will have to be included. 



XVIII.— Reply on the Term " Bryozoa." 

 By A. W. Waters, F.G.S. 



Mr. HiNCKS replied to my remarks on the terms Bryozoa and 

 Polyzoa, in the February number of the ' Annals,' and also 

 to the same effect in his recent work on the British Polyzoa, 

 in a manner which is to me exceedingly satisfactory, as it 

 gives so many quotations from Thompson's original paper, 

 and thus the question is more fully before the public. I con- 

 sider the grounds for using the term Bryozoa are thereby 

 strengthened instead of weakened, and shall therefore continue 

 to use the term I have already adopted, but "without any 

 intention of constantly attacking those who disagree Avith me, 

 as I have no wish to be led away from more serious work in 



