186 THE ROYAL SOCIETY OF CANADA 



these branches are often branched alternately or dichotomously to 

 give a very shaggy appearance. Hydrothecae inserted with their 

 bases in line and their distal ends alternately turned to right and left 

 but this feature is not so noticeable in the younger specimens, the 

 alignment may be so much out that it does not give the characteristic 

 appearance of the adult at all. The length of the internode is not 

 definite, the number of hydrothecae on each varying from 3 upwards; 

 hydrothecae tubular with the distal end pitcher-shaped like that of a 

 Diphasia and like these also with operculum of one adcauline flap. 



Gonosome. — Gonangia borne on front of branches sometimes 

 forming a definite row, oval or obovate with short neck, wide aperture 

 and distinct pedicel; surface smooth. 



Distribution. — Puget Sound (Calkins); Puget Sound (Nutting); 

 San Juan Archipelago, Ucluelet, Dodds Narrows, Queen Charlotte 

 Is., (Fraser); Rose Spit, Alert Bay, Claninnick, Clayuquot Sound, 

 off Lasqueti I., Nanoose Bay, Hammond Bay, Departure Bay, off 

 Snake I., north of Gabriola I., off Proctection I., Northumberland 

 Channel, Pylades Channel, Gabriola Pass, Gabriola Reefs, Whaleboat 

 Passage, off Matia I., Friday Harbor, off Brown I., off Waldron I., 

 off O'Neale I., Upright Channel, off Shaw I., Griffin Bay, Port 

 Townshend. 



Genus SELAGINOPSIS 



Trophosome. — Hydrothecae arranged in more than two rows or 

 longitudinal series at least on the branches; operculum usually of 

 a single abcauline flap. 



Gonosome. — Gonangia oval or obovate, usually smooth or nearly 

 so. 



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



A. Hydrothecae in 3 longitudinal series S. triserialis 



B. Hydrothecae in 4 longitudinal series 



a. Hydrothecae in each series with the distal ends as well as 



the bases in a straight line S. pinnata 



b. Hydrothecae in a series with distal ends turned alternai ely 



to right and left 5. hartlaubi 



C. Hydrothecae in 6 longitudinal series at least on the distal portion 



of the branches 



a. Hydrothecae in 4 series on proximal part and 6 rows on distal 



part of branches; hydrothecae almost wholly immersed 

 6 1 . cylindrica 



b. Hydrothecae in 6 series throughout; distal portion free 



. S. mirabilis 



