114 THE ROYAL SOCIETY OF CANADA 



Syncoryne mirabilis (Agassiz) 

 PL II, Fig. 4 

 Coryne mirabilis Agassiz, L., Cont. Nat. Hist. U.S., vol. IV, 

 1862, p. 185. 



Coryne rosaria Agassiz, A., Ill, Cat., 1865, p. 176. 



Syncoryne mirabilis Fraser, West Coast Hydroicls, 1911, p. 21. 



Trophosome. — Colony unbranched or slightly and irregularly 

 branched; stem and branches similar in size; perisarc smooth; 

 hydranth body stout for its length; tentacles 15 or more, stout, 

 strongly capitate. 



Gonosome. — Gonophores borne among or below the proximal 

 tentacles; medusae become sexually mature before liberation. 



Color. — Stem and branches horn color, hydranths rose red. 



Distribution. — Gulf of Georgia (A. Agassiz) ; Puget Sound 

 (Calkins); Bare Island (Hartlaub) ; San Juan Archipelago, Queen 

 Charlotte Is. (Fraser). On float at station, Five Finger Islands, 

 Pylades Channel, Gabriola Pass, Porlier Pass, off Matia I., Puget 

 Sound. 



In young specimens the tentacles in some cases at least, develop 

 in regular sets of four each, making the hydranth when fully extended, 

 resemble that of Stauridium productum Hincks but in the older 

 individuals all traces of this regularity is usually lost. 



The medusae, known as Sarsia mirabilis, are especially abundant 

 around the station float through a portion of the summer months. 



Family Bimeridae 



Trophosome. — Hydranths with conical or dome-shaped probos- 

 cis, surrounded by a single whorl of filiform tentacles. 



Gonosome. — Gonophores producing fixed sporosacs. 

 Key to genera of Bimeridae found in the V. I. region 



A. Gonophores on very short pedicels, sporosacs permanently sur- 



rounded by perisarc Bimcria 



B. Gonophores on branch-like pedicels, sporosacs not permanently 



surrounded by perisarc Garveia 



Genus BIMERIA 



Trophosome. — Colony branched, invested with a conspicuous 

 perisarc; hydranths fusiform; perisarc covering the base of the ten- 

 tacles. 



Gonosome. — Sporosacs covered with perisarc throughout whole 

 period of development, arising from the stem by means of very short 

 pedicels. 



