150 G Canadian Arctic Expedition, 1913-1918 



PLATE XXIV. 



Fig. 1. Actinauge borealis. New species. Longitudinal section of the upper part of the 



column; e, sphincter muscle; c, retracted capitulum: h, mesoglceajg, ectoderm with 



remains of dark coating; d, invected disk; t, t', bases of crowded tentacles; v, 



larger tubercles of the parapet; m, upper ends of the mesenteries, pink in colour; 



o, oral region of disk, 

 la. The same, less enlarged; letters the same; the inner long slender crowded tentacles 



(t', t") were turned inward, reaching the base of the stomodaeum. 

 Ib. The same; part of a transverse section made near the oral disk, where the mesenteries 



of the first and second cycles are all perfect and nearly equal. 

 Ic. Another part of the same section. 

 Id. Another section from the same region more enlarged, 

 le. Another part of the same section; 



I, I, mesenteries of the first cycle; II, a mesentery of the second cycle; r, r, sections of 



angular ridges of the endoderm; p, outer layer of stomodeal wall; h, mesoglcea; 



e, endoderm; g, ectoderm; v, verrucse; i. endoderm. 

 If. The same. Transverse section at about the middle of the stomodseum; i, i, primary 



perfect mesenteries; ii, iii, iv, mesenteries of second to fourth pairs with gonads 



removed; letters as in last. 

 Ig The same. Longitudinal section of wall. 



Ih. The same. Another longitudinal section more enlarged; lettering as in le. 

 2. Actinauge rugosa Verrill. Longitudinal section of the upper part of the column- wall; 



c, capitulum; e, sphincter muscle; h, mesogloea; g, ectoderm; v, verrucse of parapet; 



d, disk; t, bases of tentacles. 



All drawings by the author. 



