DECOLOPODIDAE 9 



St. 154. 18. i. 27. Jason Harbour to Larsen Point, South Georgia, from 2-6 miles S 84° W to 

 51 cables S 26° E of Larsen Point, 60-160 m. Large otter trawl: 2 ?? (smooth legs— i with small 

 growth of encrusting Polyzoa on oviger). 



St. 195. 30. iii. 27. Admiralty Bay, King George Island, South Shetlands, 62° 07' S, 

 58° 28' 30" W, 391 m.; M. St. Medium otter trawl: i $ (spiny legs). 



Remarks. Bouvier (191 3, p. 49) states that in the female the trunk is narrower and 

 less discoidal than in the male. In the Discovery specimens the reverse is the case, the 

 ratio of width across the second lateral process to length of trunk being o-85-o-92 in the 

 male and 0-92-1 -oi in the female. 



The accompanying table shows how this species differs from D. antarctica, Bouvier. 



Table I 

 D. australis 



W. across 2nd lateral processes _ ( 0-85-0-92 in < ? 

 L. of trunk* [o'92-i'oi in ? 



Palp 9-jointed 



Shorter, thicker ist joint to chelophore: 

 , > L. of I St ioint 

 («) L. of trunk -°-5°-°-65 



{b) 



L. of I St joint 

 W. of ist jointf 



= 4-0-5-3 



Tibiae of 4th leg somewhat shorter : 

 L. of tibia i 



(«) 

 (*) 



L. of femur 

 L. of tibia 2 

 L. of femur 



•04 



I -04-1 -13 



Somewhat shorter proboscis, as a rule : 



L. of proboscis , . . , 



-^-- f-T r~ = i-iS-i-37 (1-44 in I specimen) 



L. of trunk 



Palm relatively short ; fingers strongly arched 



D. antarctica 



= 0-96-1 -00 in cJ and ? (o-88 in one S) 



8-io-jointed 

 Longer, more slender 

 {a) = 0-66-0-75 



{b) = 6-0-8-0 



Tibiae, especially the 2nd, somewhat longer: 

 {a) = I -05-1 -08 



{b) = I -22-1 -33 



Somewhat longer proboscis : 



= I-38-I-54 



Palm relatively long, fingers but slightly 

 arched 



Ocular tubercle narrow, less than half width of cephalon | Ocular tubercle exceeding half width of 



I cephalon 



* To anterior end of abdomen. t Near base. 



Distribution. The two species of the genus Decolopoda have been recorded only 

 from the western side of the Glacial District of the Antarctic Zone. It is interesting to 

 note that both forms appear to have nearly the same range, since both have been 

 recorded from South Georgia and the South Orkneys, D. australis from the South 

 Shetlands and the type of D. antarctica from Graham Land. 



Decolopoda antarctica, Bouvier (Figs, i, 73 B, C and 74 i). 

 Caiman, 1920, p. 244, ubi bibl. 

 St. 39. 25. iii. 26. East Cumbedand 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 ,J with all claws 

 much worn (Brachiopod attached, and small groups of an encrusting Polyzoon on ventral surface). 



