NO. 4 FRASER : HYDROIDS 9 



One might readily believe that the one was derived from the other if it 

 were not for the great distance which separates the locations of the two 

 species, with no recognized distribution route connecting them. 



The genus Endothecium was established to include the species 

 E. rediiplicatum, originally obtained in Japanese waters, but later 

 obtained along the Eastern Pacific coast from Panama to Mexico. 

 E. paucinodum is the second species described but as far as the tropho- 

 some is concerned it looks much more like Halecium arboreum than 

 E. reduplicatum. There is more resemblance to the latter in the 

 gonosome. 



Genus HALECIUM 

 Halecium tenellum Hincks 



Halecium tenellum Hincks, Ann. and Mag. N.H., (3), 8, 1861, p. 252. 

 Eraser, Atlantic Hyd., 1944, p. 201. 



Distribution. — Tortuga Island, 2-5 fathoms. 



This species with a wide general distribution along the Atlantic coast 

 of North America as well as in the Eastern Pacific has been reported from 

 the nearby Dutch West Indies. 



Family HebelHdae 



Genus HEBELLA 



Hebella calcarata (A. Agassiz) 



Lafoea calcarata A. Agassiz, N.A. Acalephae, 1865, p. 122. 

 Hebella calcarata Eraser, Atlantic Hyd., 1944, p. 205. 



Distribution. — Tortuga Island, 2-5 fathoms. 



Previously the southernmost record in the north Atlantic was from 

 Tampa, Elorida. This record does not bring it much nearer to the 

 various locations in which it has been collected in the Eastern Pacific, 

 from Secas Islands, Panama, to Isla Partida in the Gulf of California. 



Eamily Lafoeidac 



Genus FILELLUM 



Filellum serpens (Hassall) 



Campanularia serpens Hassall, Trans. Micr. Soc, 1852, p. 163. 

 Filellum serpens Eraser, Atlantic Hyd., 1944, p. 215. 



Distribution. — 3 miles north of Coche Island, 21-22 fathoms. 



This location is some distance to the westward of the nearest previous 

 record, Grenada Island, and hence somewhat nearer to the numerous 

 locations in which it has been collected in the Eastern Pacific. 



