ANATOMY OF NEOHELIA PORCELLANA (mOSELEY). 



597 



Rklations ok Neoiiema. 



Our knowledge of the anatomy "I' the corals allied to Neohelia is still very 

 incoini)lete, hut the foilowiiic; tables may be some guide to us in the discussion of its 

 artinities. 



A comparison of the hard parts of Neohelia with the allied fossil genera 

 Buri/helia (20) and Diblusus (17) is given in the table subjoined. 



Unfortunately the description of Barijhelia from which this comparison is drawii 

 up by Milne-Edwards and Haime is meagre and unaccompanied by figures. 



Fmm this comparison which, it is needless to state, is very incomplete, it would 

 appear that Diblasus is more nearly related to Neohelin than is liari/fielid. When 

 further investigation of the latter is made a nearer relationship between the two genera 

 may be found to exist. 



Neohelia differs chiefly from DiblasKs, 

 1 In lh:it it may form a liuljuw tul)e. 

 •J. In till' presence of gaps in the peritheca. 



70—2 



