AMPHIPODA. 33 



In the description of this species I omitted to mention that in both pairs of 

 antennae the second joint is produced distally on each side of the third joint in a 

 subacute lobe or tooth. 



Atyloides serraticauda. 

 Atyloides serraticauda, Stebbing. 



Cape Adare, 9 Jan. 1902, 20 fm., one; and 24 Feb. 1904, in Laminaria roots, 

 13-20 fm., several. Cape Wadsworth, 15 Jan. 1902, 8-15 fms., one. 



In addition to the difference noted in the description of the specimens taken by 

 the ' Southern Cross' expedition at Cape Adare, viz., seven teeth instead of two on the 

 hind margin of the third pleon segment, the following may also be mentioned :— 



1. The eyes are hardly so large and vary much in depth of colour. 



2. The first joint of the upper antennae has a strong tooth at the distal end of the 

 lower margin. 



3. The side-plates of the first and second gnathopods have more teeth on the 

 lower margins — about seven on the first and four * on the second. These, however, may 

 be considered as merely local or age variations, and are not, in my opinion, sufiicient 

 to constitute a new species. The ' Challenger ' specimens from " off" Melbourne " 

 measured 1^ inch or about 6 mm., the largest of the Cape Adare ('Southern Cross') 

 being 15 mm. 



Stebbingia gregaria. 



Steblingia gregaria, Pfeffer, Krebse v. Sud-Georgien Die Amphipoden, Jakrbuch d. wissenschaft. Anstalten 

 Hamburg, V. (1888), p. 110. 



"W.Q., 29 Aug. 1902, Hole 12, two young specimens, length 6 mm. 



These specimens diff"er in several respects from Atyloides australis (Miers) as 

 described by Stebbing (Chall. Rep. p. 914). The basal joints of the flagellum of the 

 upper antennae are longer than wide, and there is no secondary appendage, both of 

 which points agree with Pfeff"er's description, but not with Stebbing's. The outer rami 

 of the third uropods are shorter than the inner. The telson is divided only one-third of 

 its length, with the tips of the divisions evenly rounded. In these last two points they 

 differ from both Stebbing's and Pfeffer's descriptions, but the specimens are too young 

 for any reliance to be placed on them. On the whole they agree better with Pfeffer's 

 species than Stebbing's, of the identity of which I am doubtful {see Chall. Rep. pp. 913, 

 914, and 1654). 



PONTOGENEIA MAGELLANICA. (PI. 12, fig. 20.) 



Atylopsis magellanica, Stebbing. 

 Pontogeneia magellanica, Stebbing. 



W.Q., Hut Point, 13 Sept., 1902, one ; 23 Nov., 1902, one, length, 12 mm. Tent 

 Island, 3 Jan., 1904, three. 



This is a similar instance to the last species of small variations which are insuffi- 



* In a young specimen there are only two. 



I 2 



