6 2 ZOANTHARIA 



a form has to be regarded as a special species or as a growth form or variety. It is very probable 

 indeed, that the Zoanthidae display great variation during growth, though the extent of this variation 

 cannot be judged without exact investigation (it can hardly be more than supposed), but it also 

 seems to me, that the number of species of Zoanthidae is large. I emphasize this especially with 

 regard to Lwow sky's combining Zoanthidae described as separate species into one species Sidisia 

 fatna. It is certain, that this requires revision. Even if the nematocysts in the body-wall are 

 difficult to find or are lacking, yet the nematocysts in the filament especially would give valuable 

 information. 



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