98 G Canadian Arctic Expedition, 1913-191S 



Actinauge borealis. New species. 

 Plate XXIV; Figures 1-lh. 



Among the Hudson bay actinians were two specimens that seem to belong 

 to an undescribed species resembling Actinauge rvgosa externally, but having 

 much longer tentacles which lack the large basal lobe usually seen in that genus, 

 and differ in other ways. 



Both specimens are very strongly contracted, so that the internal organs 

 form a compact mass. The longer invected tentacles reach to and below the 

 base of the long stomodaeum, or quite to the basal disk in some cases. 



The column-wall is firm, strongly wrinkled both longitudinally and trans- 

 versely; it also has vertical rows of low, but persistent, verruca?. The whole 

 surface below the capitulum is covered with a firmly adherent, thin, dark coloured 

 eipdermal coating, much as Phellia. The capitulum is strongly invected, but 

 sections show that it is covered l)>' numerous raised ridges, with a plain edge 

 toward the margin, but thickened and cienulated toward the parapet. 



The verrucae on the paTapet are nut much more prominent than those 

 lielow, and have the same structure. 



The tentacles are numerous, up to 84 to 9(i, slender, the inner ones nearly 

 as long as the column; they are so crowded by contraction that they ere angular 

 in sections. 



The stomoda-um is elongated with the walls strongly ])licat( d. Two siph- 

 onoglyps arc present. 



the s])hincter muscle (Plate XXIV, figs. 1, la) is mesogla-al and very well 

 deT,-ekiped. In transverse sections, made near the oral disk (figs. Ib-lc) and 

 inclmling some of it, there are aljout 24 to 40 perfect mesenteries, which are 

 all very much alike, with strong retractor muscles extending nearly across their 

 whole breadth. 



Between these pei-fect mesenteries there are pairs of small, narrow ones, 

 which bear gonads. A little lower down there isre twelve pairs of jjerfect mesent- 

 eries; and below the middle of the stomodaeum there are only six ]iairs. They 

 are sterile (fig. If). All the other mesenteries bear dense clusters of gonads aird 

 filaments, scjueezed compactly together by the severe contractions of the walls. 



Between every pair of mesenteries there is a narrow, angular, raised endo- 

 dernial ridge (r, r,) which appears triangular in the transverse sections. These 

 occur of larger size and less acute between the primaries, and are very small 

 between those of the fourth and fifth cycles (fig. If). 



The ectoderm (figs, le. If, h, h) is moderately thick and firm, with deep 

 grooves caused by wrinkles, and containing more or less of the dark epidermal 

 coating, and with thickened places caused by the verrucae (figs. Id, Ig, v, v). 



The mesogkra is much thicker than the ectoderm and endoderm com- 

 bined (le, Ig, h, h). It is crossed by numerous verj- fine, nearly straight, muscu- 

 lar lines, running out from the endoderm at nearly right angles, often more than 

 half way across. In some sections they are bent a little in zigzag forms. 



None of the original colour remains except a tinge of light red on the retracted 

 oral part of the disk and upper part of the mesenteries (fig. 1, m). 



The contracted spccimois r.ie nearly cylindric and higher than broad. 

 The larger one is 2,5 mm. high; 13 mm. in diameter; length of the longer retracted 

 tentacles 22 mm.; outer shorter ones, about 10 to 12 mm. 



These two specimens came from Richmond gulf, east side of Hudson bay, 

 in 2,5 fathoms, August 24, 1920, obtained from Eskimos bv F. Johansen. 



The generic position of this species seemed a little douljfful. It looks 

 much hke some species of PhcUia, but differs in having a verrucose wall and a 

 ribbed capitulum. From typical.! c/M!o?/gc it differs chiefly in lacking notable 

 basal tent;;cu!r,r lolies and in having very long slender tentacles. However, a 

 careful examination shows the liasal lo1ie on some of the less i)owerfullv com- 



