HTDROIDS OF EASTERN CANADA 



145 



Tamily EUDENDRID^. 



Trophosome. Colony branching, perisarc well developed; proboscis trumpet- 

 shaped but with much freedom of movement ; tentacles filiform in a single whorl. 



Gonosome. Gonophores producing fixed sporosacs; male and female gonophores 

 usually dissimilar; male gonophores in whorls, female gonophores in clusters. 



Characters as in the family. 



Genus EUDENDRIUM. 



KEY TO SPECIES, 



a Main stem, primary and even secondary branches, fascicled. 



h Branches and pedicels slightly annulated proximally or pedicels only 



annulated throughout. E- rameum. 



hh Branches and pedicels extensively annulated. E. cingulatum. 



aa Main stem fascicled. 



c Colony very bushy with branches extremely numerous. E. annulatum. 

 cc Colony not bushy. 



d Branches and pedicels annulated proximally. E. ramosum. 



dd Branches and pedicels entirely annulated. E. dispar. 



laa Stem simple. 



e Gonophores at the base of hydranths that are not aborted. E. album, 

 ee Gonophores at the base of aborted hydranths. 



/ Branches short and strong. E. capillar e. 



ff Branches if present long; main stem, branches and pedicels tenuous. 



E. tcnue. 



Eudendrium album Nutting. 



Trophosome. Colony minute, 8mm., stem unbranched, or with a 

 few straggling branches; stem, branches and pedicels very slender; 

 annulations indefinite. 



Gonosome. Gonophores borne at the base of the hydranth, which 

 may be smaller but not entirely aborted; male and female gonophores 

 in small clusters. 



Colour. Hydranths and female gonophores white ; male gonophores 

 pale yellow; hydrocaulus nearly transparent. 



No. 10. 



Eudendrium 



album. 



Eudendrium annulatum Norman. 



Trophosome. Stem shrubby, covered with a dense network of 

 anastomosing tubes, 10 cm., branches very numerous making the 

 colony look bushy, fascicled in the proximal portion; ultimate 

 branches slender, these and the i>edicels closely annulated through- 

 out. 



Gonosome. Gonophores clustered at the base of hydranths 

 that are on short, annulated pedicels. 



Colour. Yellowish throughout in preserved specimens. 



7'9650— 10 



No. 11. 

 Eudendriutn 

 annulatum. 



