342 HYDRACTINID^. 



INDETERMINABLE SPECIES. 



Under the name of "Eudendrium cinrulatum," Stimpson (' Marine Invertebrate Fauna of 

 Grand Manan,' p. 9) gives the following description of a hydroid from the Atlantic shores of 

 North America : 



" Polypidom small, very irregularly branched, somewhat as in Eudendrium rameicm, but not 

 so thickly; branchlets strongly ringed sometimes throughout their length, always near their 

 origin ; polypes small, with long tentacles and broad blunt proboscis. It differs from Eudendrium 

 rameum in the mode of branching." 



" Dredged in twenty fathoms on a shelly bottom off Duck Island." 



The description is unaccompanied by a figure, and it is otherwise too vague for an adequate 

 diagnosis. It is not even apparent whether it is intended to apply to a true Eudendrium or to 

 one of the other genera with which Eudendrium was at that time confounded. 



HYBRACTINIDvE. 



TROPHOSOME. — Hydrophtton forming a continuous adherent expansion, its 

 deeper parts consisting of freely intercommunicating tubes of ccenosarc, each invested 

 by a chitinous perisahc, and all adnate to one another by their sides, its free surface 

 overspread by a layer of naked ccenosaec. Hydeanths with filiform verticillate 

 tentacles. 



GONOSOME. — GoNOPHOUES in the form of fixed spokosacs. 



