414 PART II. SYSTEMATIC ACCOUNT 



Material: several fragmentary tubes, one of which contained an incomplete 

 specimen. 



Localities: the eastern Pacific Ocean, off the west coasts of Canada 

 (54°23'N, 134°41'W) and Oregon, U.S.A. (42°40 / N, 124°59'W). 



Depth: 1233-2607 m]. 



[3. Galathealinum arcticum Southward (Fig. G162) 

 Southward, 1962: 385-389, Figs. 1-10. 



This first pogonophore to be recorded from the Canadian Arctic was 

 collected in 1960 by Mr. J. G. Hunter of the Fisheries Research Board of 

 Canada and sent to Dr. Eve C. Southward who described it in the Canadian 

 Journal of Zoology (Southward, 1962). The following description is repro- 

 duced from her paper, by kind permission of the author and publishers. 

 The material consisted of two incomplete specimens, one male, one female, 

 in their tubes. 



"The general colour of the animals (preserved in formalin) is a pinkish 

 brown with lighter brown to cream-coloured epidermal glands. 



"The tentacular crown is complete in the female and consists of 126 

 tentacles attached to the protosoma in several concentric horseshoe-shaped 

 rows with the opening on the posterior side (Fig. G 162.5, D). The tentacles 

 of the male were broken while it was being removed from its tube but there 

 are at least 78 of them. Each tentacle has a band of pinnules along its inner 

 side, starting near the head as a triple row of small pinnules (Fig. G1627* 1 ) 

 and narrowing to a double row of much longer pinnules towards the 

 distal end (Fig. G162£). There is a band of cilia on each side of the row of 

 pinnules. 



"The flattened cephalic lobe is roughly triangular in outline, with a 

 truncated apex in both specimens. On the dorsal side, a curved groove 

 divides the cephalic lobe from the rest of the protosoma, and the dorsal 

 point of the bridle reaches forward nearly to this groove. A second groove 

 encircles the body just in front of the bridle (Fig. G162C). On the ventral 

 side a longitudinal groove runs from between the tentacle bases back to the 

 point of the bridle, dividing the ventral surface into two lateral lobes (Fig. 

 G1625, D). The thin dark-brown keels of the bridle lie on a low ridge of 

 slightly glandular epidermis, flanked by narrow dark-brown lines. The keels 

 meet at a point on each side of the body, but whether they actually fuse is 

 not clear. From behind the bridle to the posterior end of the mesosoma the 

 epidermis is speckled with light-coloured gland cells, some of which are 



