d6 AUSTRALASIAN ANTARCTIC EXPEDITION. 



worm has but 11 chaetigerous segments bearing notopodial cha?t8e, followed bv tlie 

 uneinigerous segments ; and therefore falls into Malmgren's genus Ereutho. He 

 named it Ereutho antarclica. 



Consequently, if reliance be jilaced wholly on the form of the uncinus, Wiiich 

 certainly is quite peculiar, Mcintosh's Polycirrus kerguelensis is in all probability this 

 Ereutho ; but he had already given the specific name " kerguelensis " to' an Ereutho 

 which has quite a different form of uncinus. Hence a new specific name is needed, 

 and we must adopt Willey's name " antarctica." 



Gravier (1911) describes, under the title "Polycirrus kerguelensis Mclnt.," a 

 worm which has 11 chietigerous and 25 uneinigerous segments, whose uncini agree 

 precisely with the figures of Mcintosh and Willey, and he remarks (p. 143) that it is 

 e ctremely probable that it is identical with Willey's spgcies. 



Later, Ehlers (1913), under the title " Ereutho kerguelensis Mcintosh " (which he 

 regards as synonymous with Willey's E. antarctica), describes a worm wth uncini 

 agreeing with that figured for Ereutho kerguelensis (not Polycirris kerguelensis) of 

 Mcintosh, but differing from that figured by Willey for his species. 



Ehlers states that the only difference between the two is that Mcintosh records 

 13 chaetigerous segments, while Willey gives the number as 11. Ehlers himself finds 

 both 11 and 12 ; and as the number of notopodial segments is variable, he concludes 

 tliat the two species are identical. But this leaves aside altogether the marked 

 difference between the uncini in the two cases. 



Ehlers refers to the conspicuous anterior lip of the anterior notopods produced 

 into a " papilliform process " (Mcintosh), but neither author figures it. I do not see 

 any such striking feature in the present worms ; the lips are nearly of a size. 



The present collection contains specimens of this species, without their tubes. 

 The wornis are for the most part coiled, and measure about 12-15 mm. with a diameter 

 of 3 mm. anteriorly. 



There are 11 segments bearing notopods with capillary chaeta?, followed by 

 25-30 segments carrying short projecting uneinigerous neuropods. The first notopod 

 is on the thii'd segment above the first pair of ventral gland shields. 



A mounted piece of the thoracic pre-uncinigerous region shows none of the 

 peculiar hooks below the capilliform chc-etse such as Ehlers describes in his Ereutho 

 kerguelensis . 



The present worms agree geiierally with the account given by (Iravier. 



Locality. — 



Boat Harbom", 3i fathoms. 



Distribution. — Kerguelen (Mcintosh), South Victoria Land (Willey) Petermann, 

 ' and South Shetlands (Gravier). 



