178 THE ROYAL SOCIETY OF CANADA 



1 . Primary branches usually unbranched A . amphora 



2. Primary branches much branched A. turgida 



b. Gonangia smooth or annulated transversely 



1. Hydrotheca? almost wholly immersed A. gigantea 



2. One-fourth to one third of the hydrotheca free 



i. Margin vertical or nearly so A. rigida 



ii. Margin nearly horizontal A. variabilis 



3. Much more than one-third of the hydrotheca free 



A . abietina 



B. Stem slender 



a. Hydrotheca with two distinct teeth A . greenei 



b. Hydrotheca? without distinct teeth 



1. Gonangium oval, smooth A. filicula 



2. Gonangium top-shaped, transversely-annulated 



A . anguina 



3. Gogangium oval, with longitudinal crests. . . .A. gracilis 



4. Gonangium oblong, smooth A. traski 



Abietinaria abietina (Linnaeus) 

 PI. XXV, Fig. 90 



Srrtidaria abietina Linnaeus, Syst. Nat., 1758, p. 808. 



Abietinaria abietina Nutting, American Hydroids,pt. 2, 1904, p. 114. 



Abietinaria anguina Nutting, Ibid., p. 119. 



Abietinaria abietina Fraser, West Coast Hydroids, 1911, p. 59. 



Trophosome. — Main stem stout, straight or slightly flexuous, 

 divided into regular internodes; primary branches large, pinnately 

 arranged, with three hydrothecae between two successive branches 

 on the same side of the stem. The primary branches are occasion- 

 ally branched ; they are divided into regular internodes. Hydro- 

 thecae large, occasionally nearly opposite, large at the base, narrowing 

 above to form a distinct neck and expanding again slightly to the 

 round, smooth margin, which is horizontal but oblique as compared 

 with the axis of the hydrotheca; a large portion of the hydrotheca, 

 sometimes more than one-half, is free from the stem. 



Gonosome. — Gonangia borne on the upper sides of branches, oval 

 with a short collar and a wide aperture; surface smooth or slightly 

 annulated. 



Distribution. — Albatross collections off the State of Washington 

 and off Vancouver Island (Nutting); San Juan Archipelago, Ucluelet, 

 Dodds Narrows, Departure Bay, Banks I. (Fraser); very abundant 

 from Queen Charlotte Is. to Puget Sound. The following localities 

 have been noted: off C. Eden&haw, off Massett, China Hat, Swiftsure 



