HTBROIDS OF EASTERN CANADA 149 



) 

 Acaulis primarius (Stimpson). 



TropJiosome. Hydranth with 8 proximal tentacles 

 and numerous short capitate tentacles scattered over 

 the distal two-thirds of the body. (From Stimpson's 

 description.) 



Gonosome. Gonophores thickly scattered over the 

 space between the proximal and distal tentacles. 

 (Frorti Stimpson's description.) 



No. 19. 

 4.canlis })riinarius (after Sti^iipson) 



Note. — AUman came to the conclusion that this Was really a stalked ■ form in 

 which the hydranth had merely broken away. He was also of the opinion that the 

 specimens that Stimpson described as later stages of this species were really of an 

 entirely different species, belonging to the genus Gorynitis or Halocharis. As 

 Stimpson gives but the one figure, that of the earlier form, and as it is itmpossible at 

 present to place the other form, it has not been included. 



Family CORY^IOEPHID^. 



Trophosome. Zooids solitary, large; hydranths with a proximal and a distal 

 set of filiform tentacles. 



Gonosome. Gonophores producing free medusae with four radial canals and 

 three of the four tentacles aborted or very much reduced. 



Genus Corymorpha. 



Trophosome. Pedicel with perisarc represented by a thin pellicle; tubtdar, fleshy 

 processes growing from the pedicel near the base; hydranth abruptly distinct from 

 the pedicel; proximal tentacles longer than distal; distal set in several continguous 

 rows. 



Gonosome. Gonophores borne on branched pedicels between the two sets of ten- 

 tacles. ' , 



Corymorpha pendula Agassiz. 



Trophosome. . Zooid 9 or 10 cm. high, when fully 

 extended; pedicel with an anastomosing canals in the 

 coenosarc, but they usually run in the same direction ; 

 the place of the hydrorhiza taken by the free ends of 

 the coenosarcal tubes. 



Gonosome. Gonophores producing medusae with 

 one long and three short tentacles. 



No. 20. 

 Corymorpha pendula. 



