66 
“TERRA NOVA” EXPEDITION. 
Palps and Ovigers shorter and stouter, but otherwise differing little from those of 
A. polaris. 
First com with a pair of conical distal spurs, the posterior much the larger. 
Femur longer than first tibia, and subequal to second. Propodus more than three 
times as long as wide, rather more curved than in A. polaris , claw a little shorter, 
auxiliaries much as in that species. 
Genital apertures distinct on second coxge of last two pairs of legs. 
Measurements , in mm. — Holotype. 
$ 
Length of trunk . . . . . . . 1 • 7 5 
Leg— 
First coxa . . . . . . . *56 
Second coxa . . . . . . . 1'0 
Third coxa . . . . . . . '52 
Femur . . . . . . . . 2'8 
First tibia . . . . . . . 2'6 
Second tibia . . . . . . . 2'8 
Tarsus and propodus . . . . . . I * 28 
Auxiliaries . . . . . . . '2 
Remarks. —The presence of distinct genital apertures suggests that this specimen 
has attained fully adult characters, in which case the completely chelate form of the 
chelophores might justify its removal to another genus. In support of this view it 
may be pointed out that the chelae, in having straight fingers meeting along their 
whole length, differ widely from the larval chelae with their strongly arched fingers, 
described in the young specimen referred to A. polaris above. It is possible, of course, 
that this is merely an individual case of late persistence of larval characters, or, what is 
practically the same thing, of precocious development of the reproductive organs, as in 
the chelophoredtearing male of Colossendeis gracilis , described by Hoek (1881, p. 70), 
or the young specimens of <'. angusta, mentioned by Meinert (1899, p. 59, PI. v, 
fig. 21). Even if this be so, however, the species would seem to be distinguished from 
A. polaris by the condensed form of the body, with the lateral processes in contact at 
the base, and by the much shorter and stouter chelophores. From A. juvenilis it is 
distinguished not only by the segmentation of the palps, but by the longer auxiliary 
claws and other minor characters. 
Genus AUSTRODECUS, Hod gson. 
Austrodecus glaciate, Hodgson (Text-fig. 20). 
A. (jlaciale, Hodgson, 1907, p. 53, PI. viii, tig. 1 ; Bouvier, 1913, p. 147, text-figs. 96 and 97. 
Occurrence .—Station 220, off Cape Adare, 45-50 fathoms ; 1 $, 1 $. Station 339, 
[ (| V , I Entrance to McMurdo Sound, 140 fathoms ; 1 $. 
