220 DISCOVERY REPORTS 



convex, and having a group of spines aggregated at the inner apex instead of three large 

 ones distributed along the margin. The ist gnathopod of the <$ is not strongly expanded 

 distally, and thus resembles more the ist gnathopod of the $ of the coastal form. 



In the absence of more abundant material, the best course is to regard these two sets 

 of specimens as forms of the same species, and to identify them with Ortmann's species. 



Distribution. Patagonia, 47°-5o° S, from coast up to 2000 ft. in the Cordilleras; 

 Magellan Strait; Falkland Islands. 



Genus Allorchestes, Dana. 

 Stebbing, 1906, p. 581. 

 Chilton, 1926, p. 515. 



Allorchestes patagonicus, Cunningham (1871), remains obscure. It may be the same as 

 Hyalella patagonica, Ortm., supra, but unless Cunningham's type can be found, it would 

 be better to ignore his species. 



Allorchestes sp. 



Occurrence: St. WS 123. Gough Island. 1 immat. 9 « mm. (shore). 



Remarks. It is unfortunate that there is only this single ? specimen, as no member of 

 this genus has hitherto been recorded from either Tristan da Cunha or Gough Island. 



Maxillary palp extending to apex of outer lobe. Gnathopod 2 a little longer than 

 gnathopod 1, 2nd joint in both rather strongly keeled on anterior margin, 5th com- 

 parable with that figured for gnathopod 1 of plnmicornis (Stebbing, 1899, Trans. Linn. 

 Soc. Lond. (2), vii, pi. xxxiii C), equally strong in gnathopod 2, 6th broadly oval, 

 especially in gnathopod 2. 



Family AORIDAE 

 Stebbing, 1906, pp. 585, 736. 

 Schellenberg, 1925, p. 164. 



Members of this family, though recorded from the sub-Antarctic (Kerguelen and 

 South America) appear to be rare in the Antarctic regions. Some specimens were col- 

 lected by the ' Gauss' but Schellenberg (1926, p. 374, fig. 60) was unable to refer them 

 to any particular genus or species on account of the absence of the 6* . All the Discovery 

 examples of this family were obtained in South African waters with the exception of two 

 specimens from the Falkland Islands. 



Genus Aora, Kroy. 

 Stebbing, 1906, p. 587. 



Aora typica, Kroy. 



Stebbing, 1906, p. 587, fig. 101. 



Barnard, 1916, p. 236 (literature). 



Schellenberg, 1926, p. 372 (fig. 59, forma anomala). 



forma gibbula, n. (Fig. 135). 

 Schellenberg, 1926, p. 372. 

 Occurrence : St. 91. South Africa. 9 <Jc? (adult and immat.) 3-5-5 mm. 



