POLYCMTA--BENHAM. 
n3 
Several of these characteristic tubes, some containing the animal, were obtained 
during the expedition of the “ Aurora.” 
The narrow, white calcareous tubes have a diameter of 2-75 mm., and the 
thickened everted lip is 4-5 mm. across. Along the course of the tube are similar 
thickened lips at intervals, indicating periods of cessation of growth. The tubes are 
more or less undulating, or may be coiled, where they are attached to some object, 
such as a stone or shell. 
Localities .— 
Boat Harbour, Station B, 25 fathoms. 
Commonwealth Bay— 
Station 1, 354 fathoms. 
Station 2, 318 fathoms. 
' Station 3, 120 fathoms. 
Station 9, 240 fathoms. 
Station 10, 325 fathoms. 
Distribution .—“ lie Narcon in the Antarctic Ocean” (Baird), Kerguelen (Grube), 
Marion Island, Heard Island (McIntosh), Magellan Strait (McIntosh, Elilers), 
Admiralty Sound, S. Victoria Land, K. Wilhelm II Land (Elders), South 
American Antarctic (Gravier). 
Genus spirorbis Daudin. 
Spirorbis nordenskjoldi Elders. 
Ehlers (1901), p. 223. 
Elders (1908), p. 165. 
Gravier (1911), p. 153, pi. XI, figs. 153, 154. 
Gravier has pointed out that it is difficult to be certain as to the identification 
of this species, as Ehlers has given no figure of it. Hence it is with some hesitation 
that I attribute our specimens to this species; they agree with the accounts referred 
to above and with Gravier\s figures. 
Localities .— 
Boat Harbour, 3-4 fathoms. 
Commonwealth Bay, Station D, 45-50 fathoms. 
Distribution .—Punta Delgada, Bouvet Island (Ehlers), Petermann (Gravier). 
*83892— P 
