82 "TERRA NOVA" EXPEDITION. 



interior, sunnounted by a single stout colunmar trunk or tube, but sliglitly 

 smaller in diameter than the basal portion, passing into a simple tube and ter- 

 minatmg abruptly in a constricted nipple-shaped aperture. Colour dark grey. 

 Walls thin and smooth, but unpolished. 



The specunens found were detached but had originally been sessile on some 

 other body. The labyrinthic structure of the base was in all cases exposed, 

 and as the specimens showed no signs of wear or disruption, it would appear 

 that the organism is very loosely attached to its host, and that there is no 

 pavement-layer separating the protoplasm from the surface of the host, such as 

 is present in I), arborescens, other than perhaps such a chitinous film as occurs 

 in India. 



The afiinities are clearly with D. liinosu, in fact the Antarctic variety closely 

 resembles young individuals of that species from the New Zealand area, except 

 in its markedly labyrinthic base, and its more depressed habit and massive 

 construction. 



Size :— The base ranges from ■ 70-1 mm. in diameter, and the maximum 

 height is about the same. The tube averages •20- '40 mm. in diameter. 



Sub-Family PILULININAE. 

 BATHYSIPHON, Sars. 



78. Bathysiphon filiformis, M. Sars (M.S.). 



Bathysiphon filiformis, G. 0. Sars, 1871, Yidensk.-Selsk. Forhandl., p. 251. 

 Brady, 1884, FC. p. 248, p). xxvi, figs. 15-20. 

 dp Folin, 1887, B. p. 279, pi. vi, figs. 4 a-e. 



Station 29. 



Two fragments referable to this species. It is possible that the two doubtful 

 specimens referred to B. argenteus should be referred to this species. 



71). Bathysiphon nifum, de Folin. 



Balhjsiphon riifum, de Folin, 1887, B. p. 28.3, jil. vi, figs. 8 «-c. 

 Station 40. 



A few individuals characterized by a light colouring which deepens into orange 

 bands at points marking slight constrictions in the shell. 



80. Bathysiphon argenteus, Heron-Allen and Earland. 



Bathysiphon argenteus, Heron-Alleu and Earland, 1913, CI. pi. iii figs 1-3 • 1916 FWS 

 p. 218. 



Stations 2, 42, 43, 44. 



The records depend upon an undoulrted specimen from Station 2 (N.Z.), and a 

 similar one from Station 44. At Stations 42 and 43 were found fragments which are 

 less distinctive but are probably referable to this species. 



