598 



ANATOMY OF NEOHELIA PORCELLANA (mOSELEy). 



3. In the presence of a horny membrane, but as this is fairly delicate ib 

 could scarcely be expected to be present in the fossil form. 



4. In the absence of a columella which is rudimentary in Diblasus. 



A comparison of Neohelia with other members of the Oenlinidae. 



Neohelia does not appear to be nearly related to any member of the Oculinidae 

 with which I have compared it, so it is necessary that, at present, it should be 

 placed as Duncan puts it in a separate alliance. 



The Research in connection with this paper has been done iu the Zoological 

 Laboratories of the Owens College, Manchester, under the supervision of Professor 

 Hickson, to whom I am greatly indebted for much assistance and advice. 



1 Fowler (12), in his description of Lophohelia remarks that the tentacles are arranged one over every 

 septum. Septa vary in number in different Individuals, so that one would suppose that the number of 

 tentacles also varies. 



