POLYCHiETA—BENHAM. 
23 
The freedom of the palps is well seen in those in which the pharynx is protruded, 
when they become widely separated, as is shown in Elders’ s figures. 
The eyes are not so large as he figures, and I find that the anterior pair are, as 
usual, larger than the posterior. 
The chsetse of the anterior segments are all alike, but further back the length of 
the appendix differs in the upper and lower members of the bundle, but not I think 
to so great an extent as is indicated by G-ravier’s figures. 
Locality .— 
Commonwealth Bay. 
Distribution. —Port Charcot, Port Circoncision (Gravier), Kaiser Wilhelm IT Land 
(Elders). 
Genus Trypanosyllis Claparede. 
Trypanosyllis gigantea McIntosh. 
Syttis gigantea McIntosh (1885), p. 193, pi. XXX, figs. 1-3; pi. XXXI11, 
fig. 4 ; pi. Xa, fig. 10 ; pi. XXXIV A, fig. 7. 
Trypanosyllis gigantea Elders (1897), p. 35. 
Trypanosyllis gigantea Elders (1901), p. 85. 
Trypanosyllis gigantea Elders (1908), p. 65. 
Trypanosyllis gigantea Elders (1912), p. 17. 
Trypanosyllis gigantea Elders (1913), p. 475, pi. XXXI, figs. 11-16. 
Trypanosyllis gigantea Gravier (1911), p. 52, pi. I, figs. 7, 8. 
Trypanosyllis gigantea Fauvel (1917), p. 200, gives further synonymy. 
This characteristic Antarctic Syllid is evidently very abundant in Commonwealth 
Bay, for there are at least twenty individuals in the collection obtained from five stations 
or perhaps from four, as one of the lots consisting of as many as fourteen specimens is 
accompanied by no information as to where they were obtained. 
Some of the specimens attain to a greater size than even those described by 
McIntosh, which reached only the length of 60 mm. The largest complete individual 
in the present collection measures 130 mm., with a diameter of 5 mm. over the body, 
and 6 mm. across the parapodia. The width of the body is equal to the length of twelve 
segments, which are thus very short. The body is very much depressed, its height 
being oidy 2 mm. McIntosh gives a figure of a transverse section through the pharyngeal 
region, where the height of the body is increased by the presence of that organ ; the 
worm is in reality much flatter than that figure would indicate. 
The colour of the preserved specimens is a pale yellow, dorsally and ventrally, 
becoming brownish anteriorly. One individual is orange brown ventrally, with a 
yellowish dorsum, and with brown markings along the margins of this surface. 
