AMPHIPODA OF THE SCO!ITISH NATIONAL ANTARCTIC EXPEDITION. 473 
The small amount of difference between some of these genera, and the difficulty of 
referring a species to its proper genus, is shown by the fact that while CHEvREUX estab- 
lished for the species in question the new genus Waldeckia, and compared it with 
Memgrates and Lepidepecreum, Mr Waker, who was independently working at the 
same species, had at first classified it under Socarnes, and Mr Stessine has since stated 
that he would have been inclined to concur in this view. Mr Sreppine has, however, 
now accepted the genus Waldeckia, and has described a new species, W. chevreuai, from 
Australia (19104, p. 572, pl. xlviis). This species, which, though undescribed, has 
been long known to me from New Zealand, differs from W. zschauw (Pfeffer) in having 
the first gnathopod quite simple, and thus offers an additional reason for retaining the 
genus Waldeckia, unless indeed W. chevyeuai could not have been as appropriately 
placed under one of the existing genera. 
Genus ORCHOMENOPSIS Sars, 1893. 
Orchomenopsis nodimanus Walker. 
Orchomenopsis nodimanus Walker, 1903a, p. 44, pl. vii. figs. 13-17. 
s - Stebbing, 1906, p. 721. 
South Orkneys, Scotia Bay, Station 325; trap. Many specimens, averaging 
about 15 mm. 
South Orkneys, Scotia Bay; 10 fathoms. March 1903. Three specimens, the 
largest 13 mm. 
South Orkneys, Scotia Bay ; 9-10 fathoms. April 1903. One specimen. 
Also taken at other times along with O. chilensis (Heller). 
These specimens agree well with the description given by Waker, and I have 
been able to compare them with co-types of his species from the British Museum, 
and find no essential difference between the specimens from the South Orkneys and 
those from South Victoria Land. ‘The species in most respects is very similar to 
O. chilensis (Heller), but can be distinguished by the slight carination of the hinder 
part of the body and by the peculiar structure of the propod of the first gnathopod ; 
in most of my specimens this is a little stouter than is shown in WaLKER’s figure, 
and it bears a tubercle on the posterior surface as described by him. 
This species occurred along with O. chalensis (Heller) in many captures. 
Orchomenopsis chalensis (Heller). 
Anonyx chilensis Heller, 1865, p. 129, pl. xi. fig. 5. 
Orchomenopsis obtusa Sars, 1891 and 1895, p. 74, pl. xxvi. fig. 2, and p. 684. 
Orchomene musculosus Stebbing, 1888, p. 673, pl. xx. 
(2) - abyssorum Stebbing, 1888, p. 676, pl. xxi. 
(2) 3 cavimanus Stebbing, 1888, p. 679, pl. xxii. 
Orchomenopsis musculosa and (?) abyssorum Stebbing, 1906, p. 84. 
(2) 3 aschauit Stebbing (part), 1906, p. 85. 
