AMPHIPODA. 33 
In the description of this species I omitted to mention that in both pairs of 
antennz 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 antenne 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, sufficient 
to constitute a new species. The ‘Challenger’ specimens from “off Melbourne ” 
measured { inch or about 6 mm., the largest of the Cape Adare (‘Southern Cross’) 
bemg 15 mm. 
STEBBINGIA GREGARIA. 
Stebbingia gregaria, Pfeffer, Krebse v. Sud-Georgien Die Amphipoden, Jahrbuch d. wissenschaft. Anstalten 
Hamburg, V. (1888), p. 110. 
W.Q., 29 Aug. 1902, Hole 12, two young specimens, length 6 mm. 
These specimens differ in several respects from <Atyloides australis (Miers) as 
described by Stebbing (Chall. Rep. p. 914). The basal joints of the flagellum of the 
upper antennze are longer than wide, and there is no secondary appendage, both of 
which points agree with Pfeffer’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 Pfefter’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. 
Pontoyeneia magellanica, Stebbing. 
W.Q., Hut Point, 13 Sept., 1902, one; 23 Nov., 1902, one, length, 12mm. Tent 
Island, 3 Jan., 1904, three. 
This is a similar instance to the last species of small variations which are insutti- 
* In a young specimen there are only two. 
