AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 471 
Genus WaALDECKIA Chevreux, 1906. 
(=Cuarcoria Chevreux, 1905, name preoccupied). 
Waldeckia zschauw (Pfeffer). 
Anonyx zschauit Pfeffer, 1888, p. 87, fig. 1. 
Orchomenopsis zschauti Stebbing, 1906, p. &5 (part). 
Chareotia obesa Chevreux, 1905, p. 163, fig. 3. 
Waldeckia obesa Chevreux, 19068, p. 15, figs. 8-10, 
5 », Walker, 1907, p. 10, pl. ii. fig. 4. 
Station 411, Coats Land, lat. 74° 1’ §., long. 22° W.; 161 fathoms. 12th 
March 1904. Many specimens, the largest 16 mm. long. 
Although I have been unable to examine specimens of Anonyx zschauit Pfeffer, 
as those described by him did not belong to the official collection of the German Expedi- 
tion of 1882-83, and consequently were not deposited in the Hamburg Museum, I feel 
confident that my specimens must be referred to his species. His description of the 
great obesity of the body, and particularly of the dorsal process on the first segment of 
the urus, which is so distinet from that of other species with which it might otherwise 
be confused, leaves no doubt upon the subject. In this species, in place of the more or 
less rounded prominence on the first segment of the urus, the process rises abruptly 
behind the usual depression into a sharp tooth, from which it slopes downwards towards 
the next segment; this is shown clearly also in Prerrer’s figure, although the figure is 
rather small. Mr Sreppinc in 1906 referred his species Orchomene cavimanus to 
PFEFFER'S species, but an examination of the mounted slides of the Challenger collection 
in the British Museum shows that the first gnathopod of O. cavimanus has the propod 
broad and not narrowing distally as in W. zschauw, and, judging from the description, 
the process on the urus does not appear the same as in that species, and it appears to me 
that O. cavimanus Stebbing is more properly referred to the widespread and variable 
species O. chilensis (Heller); see p. 474, where the question is further discussed. 
I did not at first compare my specimens with the descriptions of Waldeckia obesa 
Chevreux, but the shape of the basal joint of the third perzeopod in one of the slides 
Thad mounted proved to be so similar to the figures given by both CHevreux and WALKER 
that a full comparison was made, with the result that my specimens proved to be 
identical with that species also. The figures given by CHEvREUX and WaLKER show the 
ereat obesity of the body and the great prolongation backwards of the fourth side plates 
better than Prerrer’s; but, on the other hand, they hardly show so well the character of 
the process on the urus, though from their descriptions it seems evident that they were 
dealing with the same structure. 
I have compared the Scotia specimens with those collected by the Discovery and 
referred to this species by Mr WaLker, and find no essential difference ; in the Discovery 
specimens the third segment of the pleon is slightly more compressed and elevated into 
a blunt dorsal tooth, while the tooth on the first segment of the urus is a little shorter 
than in the Scotia specimens. 
TRANS. ROY. SOC. EDIN., VOL, XLVIII. PART. II (NO. 28). 71 
