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DEPARTMENT OF THE NAVAL SERTICB 

 Family DIOORYNID^. 



Trophosome. Colony branched or unbranched; hydranths with a single whorl 

 of filiform tentacles. 



Gonosome. Gonophores producing free-swimming, ciliated sporosacs, each with 

 two filiform, ciliated tentacles. 



Genus Dicoryne. 



Trophosome. Stolon reticular; stem unbranched or branched; hydranths with 

 a single whorl of filiform tentacles; proboscis conical. 



Gonosome. Gonophores borne on aborted hydranths, from the stem or stolon; 

 sporosacs, ciliated, free-swimming, with two ciliated tentacles. 



KEY TO SPECIES. 



a Stem thin, flexible, not annulated, slightly branched and sometimes dichotom- 



ously divided. D. flexuosa. 



b Stem stiff, erect, distinctly annulated, not dichotomously divided. i>. confcrta. 



Dicoryne conferta (Alder). 



Trophosome. Stem unbranched or with irregularly arranged, 

 erect branches, from a recticular stolon, annulated towards the base 

 and more or less wrinkled throughout; 15 mm. in height; hydranth 

 long-fusiform, with 16 tentacles. 



Gonosomi:. Gonophores borne in a cluster at the base of an 

 aborted hydranth, from the stolen and from the stem, oval; pedicel 

 long, sporosacs oval. No. 4. 



Dicoryne conferta. 



Dicoryne flexuosa Sars. 



Trophosome. Stem flexible, slightly branched or 

 dichotomously divided ; 7 mm. in height ; hydranth 

 short fusiform with about 12 tentacles. 



Gonosome. Gonophores on short pedicels, growing 

 from the stem only; sporosacs more numerous in the 

 cluster than in the preceding species. 



No. 5. 

 Dicoryne flexuosa (after Sais). 



Family SYNCORYNID^. 



Trophosome. Hydranths club-shaped, with numerous scattered, capitate ten- 

 tacles. 



Gonosome. Gonophores on body of the hydranth produce free medusa". 



