[fraser] HVDROIDS OF THE VANCOUVER ISLAND REGION 187 



Selaginopsis cylindrica (Clark) 



PI. XXVIII, Fig. 104 



Thuiaria cylindrica Clark, Alaskan Hydroids, 1876, p. 226. 

 Selaginopsis cylindrica Nutting, American Hydroids, pt. 2, 1904, 



p. 131. 

 Selaginopsis plumiformis Nutting, Ibid., p. 129. 

 Selaginopsis cylindrica Fraser, West Coast Hydroids, 1911, p. 65. 

 Selaginopsis plumiformis Fraser, Ibid., p. 67. 



Trophosome. — Stem rather stout but more so distally than prox- 

 imately, this is also true of the branches; branches regularly alternate 

 and graded in such a way as to give a plumose appearance to the 

 colony ; sometimes the branches are curved or spirally twisted and have 

 secondary branches to such an extent as to make the colony look 

 bushy. In older colonies the main stem often becomes quite woody 

 and some of the primary branches become so large that they look 

 like main stems, with pinnate branching in the same way. Hydro- 

 thecae tubular, almost wholly immersed, arranged in two series on the 

 main stem, 4 series on the proximal portions of the branches and 

 6 series on the distal portions, the two extra series being intercalated 

 at the same time, often quite near the base; aperture oval; margin 

 entire; operculum of one abcauline flap. 



Gonosome. — Unknown. 



Distribution. — Puget Sound (Calkins) ; San Juan Archipelago, 

 Queen Charlotte Is. (Fraser); off C. Edenshaw, off Massett, Rose 

 Spit, Departure Bay, off Matia I., off O'Neale I., San Juan Channel, 

 Friday Harbor, Griffin Bay, Deer Harbor. 



In my West Coast paper I expressed a doubt whether Selaginopsis 

 plumiformis was a species different from S. cylindrica. Since then I 

 have found many specimens of S. cylindrica with the large branches 

 just as described for 5. plumiformis and I am satisfied that the two 

 are the same species. 



Selaginopsis hartlaubi Nutting" 



PL XXVIII, Fig. 105 

 Selaginopsis hartlaubi Nutting, American Hydroids, pt. 2, 1004, 



p. 133. 

 Selaginopsis hartlaubi Fraser, West Coast Hydroids, 1911, p. 66. 



Trophosome. — Stem stout, irregularly branched, branches varying 

 very much in length, almost as stout as the main stem, not branched 

 again; hydrothecse in two regular series on the stem but in four series 

 on the branches; in each series on the branches, the distal ends of 

 the hydrothecœ turn to right and left alternately and the bases are 



