NO. 4 



fraser: hydroids 



159 



species 



Div. A 



Div. B 



Div. C 



South of 

 Div. B 



North of 

 Div. C 



North 

 Atlantic 



Obelia alternata 



articulata 



commissuralis 



dichotoma 



equilateralis 



geniculata 



hyalina 



microtheca 



obtusidens 



plicata 



tenuis 



Silicularia pedunculata 



Campanulina forskalea 



ramosa 



Cuspidella humilis 



Lovenella nodosa 



producta 



rugosa 



Endothecium reduplicatum. 



Halecium articulosum 



beani 



bermudense 



corrugatum 



fasciculatum 



flabellatum 



gracile 



halecinum 



insolens 



nanum 



parvulum 



regulare 



tenellum 



tenue 



tortum 



vagans 



Washington! 



Ophiodissa alternata 



laxa 



negligens 



Hebella calcarata 



Scandia corrugata 



expansa 



mutabilis 



Acryptolaria pulchella 



Eucryptolaria pinnata 



X 



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X 

 X 



