8 DISCOVERY REPORTS 



I found it impossible to be certain of the identification of many of the numerous 

 Nymphon species until I had re-examined the types of nearly every species previously 

 recorded from the Antarctic and sub-Antarctic Zones. This revision probably constitutes 

 the most important part of the paper. Species re-examined but not represented in the 

 present collection have been described and figured in a separate short paper.^ The 

 results of this study have been condensed into a synoptic key (p. 31) to the deter- 

 mination of the adult males, and a table (p. 28). Many of the species are known from 

 one or a very few specimens and several from the adult female only. Even when the 

 known species had been re-examined, the interpretation of the results was by no means 

 easy. The species appeared to fall into two fairly well-defined groups according to the 

 form of the oviger in the adult male. Each main group could again be subdivided, for 

 the most part, into smaller sections comprising 2-4 or more closely related forms, 

 although an occasional form was apparently quite isolated. When the whole genus can 

 be revised, the results of the present study may have to be considerably modified. 

 I am aware that another worker might possibly have arrived at a quite different inter- 

 pretation of the relationships of the species, but I hope the classification given here will 

 prove to be a step in the right direction. 



SYSTEMATIC ACCOUNT 

 Family DECOLOPODIDAE 

 Genus Decolopoda, Eights 

 Decolopoda australis. Eights (Fig. 73 A). 

 Bouvier, 1913, p. 48, uhi bibl. 



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. ; gy. M. Large otter trawl : i S (with Brachiopod 

 attached). 



St. MS 68. 2. iii. 25. East Cumberland Bay, South Georgia, 17 miles S i E to 8i cables SE x E of 

 Sappho Point, 220-247 m. Large rectangular net: i c? (colour in life— bright orange on legs; body, 

 chelophores, palps and ovigers brown-red). 



St. 123. 15. xii. 26. Off mouth of Cumberland Bay, South Georgia, from 4-1 miles N 54° E of 

 Larsen Point, to 1-2 miles S 62° W of Merton Rock, 230-250 m.; gy. M. Large otter trawl: 2 S6 

 (i with Brachiopod attached). 



St. 142. 30. xii. 26. East Cumberland Bay, South Georgia, from 54° ii'3o"S, 36° 35' W to 

 54° 12' S, 36^ 29' 30" W, 88-273 m. Large otter trawl: 2 ??. 



St. 148. 9. i. 27. Off Cape Saunders, South Georgia, from 54° 03' S, 36° 39' W to 54° 05' S, 

 36° 36' 30" W, 132-148 m.; gy. M. St. Large otter trawl: i S- 



St. 149. 10. i. 27. Mouth of East Cumberland Bay, South Georgia, from 1-15 miles N 76^° W 

 to 2-62 miles S 11° W of Merton Rock, 200-234 m. Large otter trawl: i ? (with small patches of 

 Polyzoa on limbs). 



^ Gordon, 1932. 



