66 



TERRA NOVA" EXPEDITION. 



Palfs and Ovigers shorter and stouter, but otherwise differing little from those of 

 A. polaris. 



First coxa 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. jwlnrii^, claw a little shorter, 

 auxiliaries much as in that species. 



Genital apertures distinct on second coxae of last two pairs of legs. 



Measurements, in mm. — Holotype. 



$ 

 Length of trunk . . . . . . . 1"75 



Leg- 



First coxa 

 Second coxa 

 Third coxa 

 Femur 

 First tibia 

 Second tibia 

 Tarsus and propodus 

 Auxiliaries 



56 







52 



8 

 6 



8 



28 



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. 2')olaris 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 chelophore-bearing male of Colossendeis gracilis, described by Hoek (1881, p. 70), 

 or the young specimens of C. 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. jJolaris 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, Hodgson. 



Austroclecus glaciale, Hodgson (Text-fig. 20). 

 A. glaciale, Hodgson, 1907, p. 53, PL viii, fig. 1 ; Boiivier, 1913, p. 147, text-figs. 96 and 97. 



Occurrence. — Station 220, off Cape Adare, 45-50 fathoms ; 1 ^, 1 ?. Station 339, 

 Entrance to McMurdo Sound, 140 fathoms ; 1 ^. 



