50 G Canadian Arctic Expedition, 1913-1918 



EXPLANATION OF PLATES. 

 Pl.\te I. 



Fig. 1. Gersemia ruhiforviis (Pallas.) One of the polyps nearlj- expanded, somewhat flattened by pressure. 



s about 20. 

 From Station 20g, Port Clarence bay. 

 Fig. la. The same. Another polyp, less compressed, sho"U"ing the small spicules of the anthocodial por- 

 tion, s about 20. 

 la*. One of the smaller immature polyps. 

 Fig. lb. The same: two of the tentacles. x about 45. 

 s, s^ s", spicules from the anthocodia. x 45. 

 Fig. Ic. The same: tip of a branchlet with retracted polyps showing the character of the calicles. 

 Figs. Id, Id^. The same: sections of branches showing the arrangement of the longitudinal tubes: Id is 



from a large branch. x about 10. 



Fig. le. The same: disk of a polyp with the tentacles removed. x 20. 



Fig. If. The same: group of the eggs from the tubes, some are immature. x 20. 



Figs. 2, 2a. Gersemia canadensis, nev^sp.Ty-pe. Twoof the exsert polyps, somewhat contracted, x 20. 

 Figs. 2b, 2c. The same: two nearly retracted polyps, exposing the anthocodia above the calicle; 2c 



has some young polyp calicles around the mature one. x 20. 



Fig. 2d. The same: end of a branch showing a group of stellate calicles and one anthocodia. x 20. 



Fig. 3. Gersemia rubijormis: a pale variety from Orphan Bank. A large calicle and anthocodia from the 

 tip of a branchlet, surrounded by immature calicles. x 20. 



