94 ■ DISCOVERY REPORTS 



The subsequent dorsal cirri are alternately long and short, the longer being about twice 

 the length of the feet including the bristles. Just below the dorsal cirri swimming bristles 

 are beginning to appear. The chaetal lobe (Fig. 29, b) is roughly triangular, the apex 

 of the triangle being formed by the tips of the three acicula above the bristles. The 

 bristles (Fig. 29, c) have long slender shafts with simple unidentate hooked blades. The 

 ventral cirri are massive processes comparable, as in Gravier's Pionosyllis comosa, with 

 the chaetal lobe. 



The pharynx is armed with a single large tooth and as far as I can see has no crown 

 of papillae: it reaches to the loth chaetiger and the proventriculus to the 24th. 



Remarks. This species is characterised by its large size, its distinctive dorsal colour 

 bands and its unidentate chaetal blades. I know no other Pionosyllis that has this 

 combination of characters. It may, however, represent the epitocous phase of the closely 

 allied P. stylifera, Ehlers, but the partly sexually modified specimens from Auckland 

 Island attributed to Ehlers' species by Augener (1924, p. 50) have a different colour 

 pattern and a number of bristles with linear end-pieces, absent in my examples. 



Genus Eusyllis, Malmgren 



Eusyllis kerguelensis, Mcintosh. 



Mcintosh, 1885, p. 191, pi. xxix, fig. 4; pi. xxxiii, fig. 3; pi. xv A, fig. 13. 

 Gravier, 1907, p. 17, pi. ii, figs. 14-16. 



St. 39. 25. iii. 26. East Cumberland Bay, South Georgia. From 8 cables S 81° W of Merton 

 Rock to 1-3 miles N 7° E of Macmahon Rock. 179-235 m. Gear OTL. Bottom: grey mud. One 

 specimen. 



St. 51. 4. V. 26. Off Eddystone Rock, East Falkland Island. From 7 miles N 50° E to 7-6 miles 

 N 63° E of Eddystone Rock. 115 m. Gear DLH. Bottom: fine sand. Three specimens. 



St. 53. 12.V.26. Port Stanley, East Falkland Island. Hulkof "Great Britain." o-2m. GearRM. 

 One specimen. 



St. 56. 16. V. 26. Sparrow Cove, Port William, East Falkland Island. i| cables N 50° E of 

 Sparrow Point. io|-i6 m. Gear BTS. One specimen. 



St. 57. 16. V. 26. Port William, East Falkland Island. 5I cables S 20° W of Sparrow Point. 

 15 m. Gear BTS. One specimen. 



St. WS 72. 5. iii. 27. 51° 07' 00" S, 57° 34' 00" W. 95 m. GearOTC. Bottom : sand and shell. 

 One specimen. 



Remarks. The body is very massive and much arched dorsally as in Mcintosh's 

 description. The prostomium (Fig. 30, a) is broad and has a median posterior cleft, but 

 the transverse prostomial ridges are not equally visible in all these specimens. The two 

 uppermost bristles (Fig. 30, b) in every foot (Fig. 30, c) are long and slender and resemble 

 Ehlersia bristles. In Mcintosh's type the two uppermost bristles are also longer and 

 more slender than the rest, but they do not differ from the rest to the same extent as 

 the homologous bristles in these specimens, which are nearer to those described as 

 E. kerguelensis by Willey in his 'Southern Cross' report than they are to Mcintosh's 



