POLYCH^TA— BENHAM. 23 



The freedom of the palps is well seen in those in which the pharynx is protruded, 

 when they become widely sej^arated, as is shown in Ehlers'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 chaetse 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 e.xtent as is indicated by rrravier's figures. 



Locality. — 



Commonwealth Bay. 



Distribution. — Port Charcot, Port Circoncision (Gravier), Kaiser Wilhelm II Land 

 (Ehlers). 



Genus Trypanosyllis Claparede. 



Trypanosyllis oigantea Mdi/tosh. 



Syllis gigantea Mcintosh (1885), p. 193, pi. XXX, figs. 1-3; pi. XXXIII, 



fig. 4 ; pi. Xa, fig. 10 ; pi. XXXIV A, fig. 7. 

 Trypanosyllis gigantea Ehlers (1897), p. 35. 

 Trypanosyllis gigantea Ehlers (1901), p. 85. 

 Trypanosyllis gigantea Ehlers ( 1908), p. 65. 

 Trypanosyllis gigantea Ehlers (1912), p. 17. 



Trypanosyllis gigantea Ehlers (1913), p. 475, pi. XXXI, figs. 11-16. 

 Trypanosyllis gigantea Gravier (1911), p. 52, pi. I, figs. 7, 8. 

 Trypanostjllis 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 

 accompa^iedby 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 only 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 niarkings along the margins of this surface. 



