UYDROmS OF EASTERN CANADA 



147 



Eudendrnim ramosum (Linna?up). 



TropJiosome. Stem slightly fascicled, much and 

 irregularly branched, height 15 cm. ; hydrauth pedicels 

 usually vertically placed on the pinnately arranged 

 branches ; annulations at base of branches and pedicel>. 



Gonosonhe. Gonophores borne at the base of the 

 hydranth or some distance down the pedicels; hydranths 

 normal or reduced in si'ze. 



Colour. Hydranths and male gonophores vermilion 

 or pink ; female gonophores bright orange-red. 



No. 15. 

 EudendriiDii ramosum. 



Eudcndriain tcitiw A. Agassiz. 



Trophosome. Stem simi)le, height l.")mm.; branch- 

 ing irregular, the branches and pedicels long and very 

 slender, scarcely annulated. 



Gonosome. Gonophores borne on aborted hydranths 

 on pedicels shorter than those supix>rting the normal 

 hydranths. 



Colour. Bright pink throughout. 



No. 16. 

 Eudendrium tenue. 



Family HYDRACTINID^. 



Trophosome. Colony formed of distinct nutritive and generative zooids from 

 a common basal copnosarc, which ordinarily is beset with spines; other kinds of 

 zooids may be present; hydranths with one row of filiform tentacles; proboscis conical 

 or clavate. 



Gonosome. Gonophores in the form of fixed sporosacs on special generative 

 zooids. 



Genus Hydracjinia. 



Characters as in the familv. 



Ilydractinia ecJiinata (Fleming). 



Trophosome. Colony rising from a basal coenosarc, which overlies a ehitijious, 

 encrusting plate, provided with jagged spines at intervals; hydranths capable of 

 79550— lOi 



