10 AUSTRALASIAN ANTARCTIC EXPEDITION. 



PAGE. 

 Family Ampharetidse 



Phyttocomus dibranchiata sp. nov 97 



Amytltas membranifera gen. sp. nov 102 



Family Capitellidae 



Isomastus perarmatus Gravier ... 105 



Family Maldanidae 



RJwdine intermedia Arwidsson 105 



Isocirrus yungi Gravier ... ... ... ... ... ... 106 



Family Arenicolidse 



Arenicda assimilis var. affinis Ash worth 108 



Family Chlorhsemidae 



Flabettigera mundata Gravier 108 



Family Sabellidse 



Potamilla antarctica Kinberg 109 



Family Serpulidse 



Serpula vermicularis var. narconensis Baird ... ... ... 112 



Spirorbis nordenskjddi Ehlers 113 



II. POLYCMTA FROM COMMONWEALTH BAY. 



I have been supplied by Mr. J. G. Hunter, Biologist to the expedition, with the 

 following information as to the collection of the worms : 



' During the greater part of the year 1912 dredgings were carried out in a small 

 boat-harbour close to winter quarters. The depth varied from 2-5 fathoms ; the 

 bottom for the most part muddy, and dredgings yielded a considerable number of 

 Annulates, which form the chief constituent of the fauna of these shallow waters. 



' Dredging in deeper water was prevented by the abnormal weather conditions 

 that prevailed. In these latitudes the sea generally freezes over during the winter, 

 and then by digging channels in the ice a dredge can be lowered. The violence of the 

 winds at Adelie Land, however, prevented the sea from freezing, excepting at the 

 beginning of September, 1912, when, during a calm lasting for several days, the sea 

 froze sufficiently to allow of dredging operations. And so, on the 3rd and 4th of that 

 month, rich hauls were made in depths from 15-30 fathoms. 



' While the ' Aurora ' was anchored in Commonwealth Bay, several dredgings 

 were made with a small hand-dredge (a) on 20th January, 1913, in 15-20 fathoms ; 

 (b) on 14th December of the same year, in 45-50 fathoms ; and (c) on 21st of the month , 

 in 55-60 fathoms. 



