336 



DE. S. J. HICKSON — EEVISION OF THE 



To these must be added the species of those genera that I have shown can no longer 

 be separated from Clavularia : — 



To these must be added two species, Rhizoxenia alba and Sympodiimi margaritaceum^ 

 described by James Grieg from the coasts of Norway, both of them being undoubtedly 

 species of Clavularia : — 



The following species have been too imperfectly described to enter into any modern 

 system : — Anthelia rubra of delle Chiaje, Antlielia olivi and AntheUa donmncula of 

 de BlainviUe. 



Genus Stmpoditim (Ehrenberg). 



Some doubt has been thrown upon the stability of this genus by the recent investi- 

 gations of von Koch (18) upon Symjjodium coraHoides, who has shown that this form 

 is a true Alcyonid adapted to live on a Gorgonia stem, and proposes that its name should 

 be changed to Alcyonium coraHoides. It is possible that, when they are properly 

 examined histologically, the other species attributed to Sympodium may turn out to be 

 after all true Alcyonians with a modified habit. For the present, however, it may be 

 allowed to stand provisionally, and the reader may be referred to the excellent account ot 

 the genus in the 'Challenger ' volume for the species that have been hitherto described. 



