52 r. Canadian Arctic Expedition, 1913-1918 



Plate II. 



Fig. 1. Gersemia rubiformis (Ehren.) Red spicules from a Port Clarence bay specimen. Station 20g. 



X about 16.5. 



Fig. 2. The same; group of red spicules from a specimen from Station 2-i; a — g are from the superficial layer 

 of the calicles: e, f are endwise views; h — k are from the stalk. x about 165. 



Fig. 3. The same. Red spicules of specimen from point Barrow — mostly from the superficial layer 

 of a branch. x 165. 



Figs. 4, 4a^. The same. \ pale variety with nearly white spicules, from Orphan Bank; Figs. 4, a — c are 

 from the stalk; 4a, a — m are mostly from the external layer of the calicle, and surrounding 

 surface layer; j is a compound cross; i, j , k, are end views. x 165. 



Fig. 5. Gersemia canadensis, new species, type. Group of spicules from an entire branchlet and the basal 

 expansion; a — g are the larger spicules from the thin attached base; a, b, c, are classed as 

 warted double-spindles; e, f, are irregular double spindles; h,-o, are mostly white double- 

 spindles from the surface layer of the calicles; n, n, are end views of the same kind; p is an 

 irregular compound cross; q, r, r, s, are simple warted spindles; t', t", are slender spindles 

 from the anthocodial portion of the calicles. x 165. 



Fig. G. G. rubiformis (Fhrenberg). Red spicules of the larger kinds from a specimen from Point Locker, 

 c is seen endwise, e is a compound cross-shaped form frequent in this species. x 165. 



