Crustacea.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 627 



Genus Atyloides, Stebbing, 1888. 

 Distribution. — Subantarctic and antarctic regions ; some species in fresh waters. 



Atyloides serraticauda, Stebbing. 



Atyloides serraticauda, Stebbing, Rep. " Challenger," xxix, p. 920, pi. Ixxviii, 

 1888 ; Walker, Journ. Linn. Soc, xxix, pi. ii, fig. 90, 1903 ; Chevreux, 

 Exped. antarct. fran9aise, Amphipoda, p. 87, 1906 ; Walker, Nat. 

 Antarct. Exped., Amphipoda, p. 33, 1907. 



A few specimens of this species were taken along with Atyloides magellanica in 

 Carnley Harbour, Auckland Islands (Professor W. B. Benham). Stebbing's original 

 species was taken " off Melbourne." Mr. Walker records this species from Cape 

 Adare and Cape Wadsworth, and M, Chevreux has examined specimens from Flanders 

 Bay, so that the species is evidently widely distributed in antarctic and subantarctic 

 seas. 



My specimens agree well, on the whole, with Stebbing's description, particularly 

 as regards the telson ; but in some of them the posterior margin of the third pleon 

 segment is almost smooth, and it is evident, as Mr. Walker has pointed out, that 

 the number of teeth on this margin is subject to variation. In this species, as in 

 many others, the southern specimens appear to be larger than those found further 

 north : mine do not measure more than about 6-8 mm., while the largest from Cape 

 Adare was 15 mm. in length. This species bears a very close general resemblance to 

 A. magellanica (Stebbing), and must be placed in the same genus. I doubt if there is 

 any good reason for retaining the genus Atyloides as distinct from Paramoera, though 

 I follow Stebbing, and retain it at present. A. serraticauda seems to differ from 

 A. magellanica only in having both pairs of gnathopods much longer and more 

 slender, and at one time I was inclined to consider the two as forms of one species 

 — as, indeed, they may really be. My specimens of the two species were taken 

 together, and it is worthy of note that during the " Discovery " Expedition the 

 two species were taken from places not very far apart, and during the French 

 Antarctic Expedition of 1903-5 both species were collected at Flanders Bay. 



Atyloides magellanica (Stebbing). 



Atylofsis magellanica, Stebbing, Rep. " Challenger," xxix, p. 925, pi. Ixxix, 

 1888. Pontogeneia magellanica, Stebbing, " Das Tierreich Amphipoda," 

 p. 360, 1906 ; Walker, Nat. Antarct. Exped., Amphipoda, iii, p. 33, 

 pi. xii, fig. 20, 1907 ; Chevreux, Exped. antarct. fran9aise, Amphi- 

 poda, p. 64, figs. 37-39, 1906. 



A few specimens of this species were taken in Carnley Harbour along with 

 A. serraticauda, Stebbing. 



These agree well with the description given by Chevreux, and also with that 

 given originally by Stebbing, though in his specimen the antennae were wanting. 

 My specimens, however, have a small one-jointed accessory flagellum on the upper 

 antenna. Chevreux says that in his specimens there is no appendage ; but, as 

 pointed out elsewhere, this difference is not sufficient to rank as a specific distinc- 

 tion. In all other respects my specimens agree very closely with Chevreux's 

 description, and the telson and third uropod in particular appear identical with the 



