WEST COAST HYDEOIDS 39 



with from one to five rings. The rim of the opening is raised on 

 a distinct collar, with diameter very much less than that of the 

 part of the gonangium that supports it. 



OBELIA FEAGILIS Calkins 



Obelia fragilis Calkins, Some Hyclroids of Puget Sound, 1899, p. 355, 



Distribution. — Port Townshend (Calkins). 



OBELIA GELATINOSA (Pallas) 



Serttdaria gelatinosa Pallas, Elenehns Zoophytorum, 1766, p. 116. 

 Obelia gelatinosa Hns'CKS, British Hydroid Zoophytes, 1868, p. 151. 

 ObeJia gelatinosa Calkixs, Some Hydroids of Puget Sound, 1899, p. 357. 



Distrihufion. — Discovery Bay, "Wash. (Calkins). 



OBELIA GENICULATA (Linna?us) 

 Sertularia geniculata Linnjeus, Systema Naturae, 1767, p. 1312. 

 Obelia geniculata Torrey, Hydroida of the Pacific Coast, 1902, p. 58. 

 Obelia geniculata Torrey, Hydroids of San Diego, 1904, p. 15. 



Distribution. — San Francisco, Catalina Island, Coronado Is- 

 land (Torrey). 



OBELIA GRACILIS Calkins 

 Obelia gracilis Calkins, Some Hydroids of Puget Sound, 1899, p. 353. 

 Distribution. — Scow Bay, Port Townshend, Wash. (Calkins) ; 

 San Juan Archipelago. 



OBELIA GEIFFINI Calkins 

 Obelia grifini Calkins, Some Hydroids of Puget Sound, 1899, p. 357. 

 Distribution. — Puget Sound (Calkins) ; Departure Bay. 



OBELIA LONGISSIMA (Pallas) 

 Sertularia longissitna Pallas, Elenehus Zoophytorum, 1766, p. 119. 

 Obelia longissima Clark, Alaskan Hydroids, 1876. p. 212. 

 Distribution. — Unalaska (Clark) ; Banks Island, Departure 

 Bay, Dodd's Narrows, San Juan Archipelago. 



OBELIA PLICATA Hineks 

 Obelia plicata HixcKS, British Hydroid Zoophytes, 1868, p. 159. 

 Obelia plicata Nutting, Hydroids from Alaska and Puget Sound, 1899, 

 p. 741. 



Obelia plicata Calkins, Some Hydroids of Puget Sound, 1899, p. 357. 

 Obelia plicata Nutting, Hydroids of the Harriman Ex. 1901, p. 173. 



Distribution. — Puget Sound (Nutting) ; Puget Sound (Calk- 

 ins) ; Orca, Alaska (Nutting) ; Departure Baj-, San Juan Archi- 

 pelago. 



