^2 DISCOVERY REPORTS 



St. i8i. i2.iii. 27. Schollaert Channel, Palmer Archipelago, 160-335 m.; M. Large otter trawl: 

 20 specimens. 



St. 182. 14. iii. 27. Schollaert Channel, Palmer Archipelago, 278-500 m.; M. Large otter trawl : 

 several specimens. 



St. 190. 24. iii. 27. Bismarck Strait, Palmer Archipelago, 315 m.; M. R. Large dredge: 4 speci- 

 mens (i immature). 



St. 195. 30. iii. 27. Admiralty Bay, King George Island, South Shetlands, 391 m.; M. St. 2 adult 

 and 2 immature specimens with Nymplwn cliarcoti and A', aiistrale. 



Redescription of holotype (9). Tnmk compact; lateral processes separated by 

 approximately half their own diameter, last two pairs almost in contact proximally. 

 Neck short ; base of oviger occupies the entire space between first lateral process and 

 anterior cephalic lobe. Ocular tubercle three times as high as wide ; eyes small, situated 

 near the apex. There is a pair of long setae ^ on the mid-dorsal surface of segments 1-3 

 and on each cephalic lobe. 



Proboscis slightly longer than cephalic segment, a little shorter than scape ; stout and 

 sub-cyhndrical. 



Abdomen reaching to middle of second coxa ; wide in middle and tapering abruptly 

 towards the apex; setae very minute. Not elevated. 



Chelophore. Scape setose, length 4-5 times the distal width. Palm long and narrow, 

 equal to movable finger which is armed with 40-42 spinules ; immovable finger with 

 30-33 spinules and a setose pad on the proximal half (Fig. 32 o). 



Palp very similar to that of N. brevicaudatum, Miers (for proportions of segments 2-5 

 see Table V). 



Oviger. Terminal claw slightly longer than tenth segment, armed with eight long 

 spinules. Total number of denticulate spines 18 (6 + 5 + 3 + 4). Segments 4-6 rather 

 long, in the proportions 1-43 : 171 : i (Fig. 27 d). 



Third leg. Second coxa equal to the sum of the other two (dorsal measurements). 

 Femur robust, 3-5 times as long as wide; first tibia the longest segment (Table III). 

 As in A'', brevicaiidatimi there are long setae on the legs, especially on the three principal 

 segments. 



Tarsus and propodus slender, elongated, the former exceeding the latter in length 

 (Fig. 31 a). Claw approximately one-third of propodus, auxiliaries well developed. 



Remarks. The holotype, which is now rather damaged and broken, is very closely 

 allied to A^. brevicaudatum, Miers, but the tarsus is longer, not shorter, than the propodus 

 (cf. Fig. 31a and b). A number of specimens in the Discovery collection have been 

 referred to A^. biartictdatum, Hodgson, because the tarsus is consistently longer relative 

 to the propodus than in A^. brevicaudatum. In adults the tarsus is equal to or longer than, 

 and in immature specimens is only a very little shorter than, the propodus (cf. Fig. 31 a, 

 c and b, d). The movable finger of the chela is rather longer than the palm. 



This species is very closely related to, and may prove to be only a more southern 



1 There are also a number of long setae on each lateral process, but they have been rubbed off. 



