COELENTERATA 53 



Plumularian Hydroids 



Feather-like hydroids with hydrothecae on one 

 side of the branches only. Nematophores, minnte 

 trumpet-shaped or tubular organs containing- sting- 

 ing cells (nematocysts), are always present. 



Plumularia alternata Nutting 



PLATE II. Fig. 14 



About one-half inch in height; hydrothecae not 

 stalked, arranged on one side of the branches only; 

 branches divided into segments, every other one 

 supporting a hydrothecae; nematophores movable. 



On sea-weed, etc., from New Jersey southward; 

 common near Beaufort, North Carolina. First 

 record in New Jersev (Great Egg Harbor Bav, July 

 3, 1931). 



Plumularia floridana Nutting 



PLATE II. Fig. 16 



Resembles the above except that the hydro- 

 thecae are more cylindrical an*:! there are usually 2 

 or 3 aimulations at each node. 



On sea-weed, etc., Delaware Bay (first record, 

 August 4, 1931), Chesapeake Bay, Beaufort, North 

 Carolina, and southward. 



