174 THE ROYAL SOCIETY OF CANADA 



Grammaria immersa Nutting 



PI. XXIII, Fig. 85 



Grammaria immersa Nutting, Harriman Hydroids, 1901, p. 176. 

 Grammaria immersa Fraser, West Coast Hydroids, 1911, p. 50. 



Trophosome. — Stem stout but not so stout as that of G. abietina; 

 branches given off at irregular intervals, forming nearly a right angle 

 with the stem, constricted at the base; hydrothecae so much immersed 

 that only a short portion of the distal extremity shows; the free portion 

 is nearly at right angles to the stem and the margin is vertical. 



Gonosome. — -(not previously described) Coppinia mass almost 

 globular but slightly elongated in the direction of the stem; one mass 

 measured 6 mm. in long and 4 mm. in transverse diameter, and that 

 relation holds very nearly for all other masses examined; the hydro- 

 thecae are long, slender and very numerous, much similar to those in 

 some species of Lafcea. 



Distribution. — Dodds Narrows (Fraser); off Lasqueti I., North- 

 umberland Channel, Gabriola Reefs. 



Genus LAFŒA 



Trophosome. — Mature stems strongly fascicled and erect, young 

 stems may be creeping; hydrothecae, with but few exceptions, entirely 

 free from the stem; no diaphragm in the hydrothecal cavity. 



Gonosome. — A coppinia mass. 



Key to the species of Lafœa found in the Vancouver I. region 

 A. Hydrothecae sessile, sometimes slightly adherent at the base 



L. dumosa 



P>. Hydrothecae pedicellate 



a. Pedicel making an angle of less than 45° with the stem 



L. gracillima 



b. Pedicel making an angle of more than 45° with the stem. . . . 



L. fruticosa 



Lafœa dumosa (Fleming) 



PI. XXIII, Fig. 86 



Sertularia dumosa Fleming, Edin. Phil Jour., II, 1828, p. 83. 

 Lafœa dumosa Fraser, West Coast Hydroids, 1911, p. 51. 



Trophosome. — Mature stem strongly fascicled, erect, coarse, much 

 branched, branches also coarse; young stem either erect or creeping 

 over other hydroids; hydrothecae sessile but usually free from the stem, 

 occasionally towards the distal part of the stem the hydrotheca is 

 adherent; even when the base is free the proximal portion often passes 



