Van Beneden on the genera Eleutheria and Synhydra. 249 



We propose to divide the genera and the species of the Tubu- 

 laria as follows : — 



The Hydra do not belong to this family, on account of their 

 arms or tentacles, which are hollow and in direct communication 

 with the digestive cavity. The tentacles are solid in all the Tu- 

 bular ia. There are besides differences in the embiyo. The Cam- 

 panularia are more nearly related to the Tubular ice than to the 

 Sertularice. Their mode of reproduction is identical. 



I. Genus Pennaria, Goldf. 



Polyps with polypidoms ; tentacles of two kinds, of which the superior 



ones are scattered and in several rows. 

 P. Cavolinii = Sertularia pennaria, Cavol. 

 Bay of Naples. 



II. Genus Tubularia, Pallas. 

 Polyps with polypidoms ; tentacles of two kinds, in two rows. 

 T. calamaris. Pall. = Tubularia indivisa. 



Coasts of England and Belgium. 

 T. coronata, Abildg. 



Coasts of Belgium and Heligoland. 

 T. Dumortierii, Van Ben., nov. spec. 

 Coast of Belgium. 



III. Genus Syncoryna, Ehrenb. 

 Polyps with polypidoms ; tentacles all alike, in several rows, 



S. pusilla, Ehr. = Coryne pusilla, Gaertner. 



Coasts of England and Belgium. 

 S. Listerii, Van Ben. = Coryne, Lister. 



Coasts of England and Belgium. 

 5. ramosa, Sars = Stipula ramosa, Sars. 



Coast of Norway. 

 S. Sarsii, Lov^n. 



Coast of Sweden. 

 S. Chamissonis, Ehr. = Coryne ramosa, Cham, et Eysenh. 



Coast of England. 



IV. Genus Corydendrium, nov. gen. 



Polyps with polypidoms ; tentacles all alike, scattered. 



C. parasiticum = Sertularia parasitica, Cavol. 

 Bay of Naples. 



V. Genus Eudendrium, Ehrenb. 

 Polyps with polypidoms ; tentacles in one row. 

 E. ramosum, Ehr. = Tubularia ramosa. 



Coasts of Ostend and England. 

 E. brio'ides, Ehr. = Tubularia musco'ides. 



Coasts of Ostend and England. 

 Ann. ^ Mag. N. Hist. Vol.xv. T 



