628 SUBANTARCTIC ISLANDS OP NEW ZEALAND. [Crustacea. 



form figured by him. Tlie gnathopods, which are considerably elongated, also agree 

 well with the figure given by Walker for this species ; but, on the other hand, he 

 figures the telson with the sides somewhat convex and free from setae. 



This species, though originally placed by Stebbing under Atylopsis, was after- 

 wards transferred by him to Pontogeneia, and in this he is followed by both Walker 

 and Chevreux. It appears evident, however, from Chevreux's description that the 

 joints of the flagellum of the upper antenna are not produced at every third or fourth 

 joint, as in the other species of Pontogeneia ; and, moreover, the telson hardly agrees 

 with that found in these species, since in them the two terminal lobes of the telson are 

 rounded and without setae. In my specimen there is a very slight widening of the 

 alternate joints of the flagellum of the upper antenna, similar to that in Paramoera 

 austrina, but to a much less degree. These points, together with the fact that the 

 upper antenna may possess a one-jointed accessory appendage, seem to me to show 

 that the species comes nearer either to Atyloides or Paramoera, if, indeed, these two 

 genera are to be kept distinct, and for the present I leave it under Atyloides. 



Chevreux has described under this genus a species, A. longicornis, which appears 

 to be closely allied to A. magellanica, though the telson is rather more like that of 

 A. serraticauda. In many respects both A. magellanica and A. longicornis come 

 very close to Paramoera austrina (Spence Bate), and at one time I was inclined to 

 place A. magellanica under Paramoera ; but it differs from typical specimens of 

 P. austrina, the only species of that genus, in having the gnathopods longer and more 

 slender, and in possessing fewer long setae on the antennae. 



Atyloides aucklandicus, Walker. 



Atyloides aucMandicus, Walker, Ann. & Mag. Nat. Hist., ser. 8, ii, p. 33, 

 pi. V, figs. 1, 2, 1908. 



Several specimens were collected by Professor W. B. Benham from a small 

 fresh-water pool on Enderby Island into which a small stream emptied. In the 

 stream were found specimens of Chiltonia mihiwaka (described below), the present 

 species having been found in the pool itself. 



I refer these specimens with some hesitation to Mr. Walker's species. In most 

 respects they agree with his description, but his account is hardly detailed enough 

 to make one quite certain of identifying a species in this family, where there is such 

 a close resemblance between all the members ; moreover, as there is no statement 

 to the contrary, Mr. Walker's specimens are presumably marine. I am extremely 

 doubtful whether the young imperfect specimen which he mentions really belongs to 

 the same species as his other two specimens. 



My specimens agree well with the generic description of Atyloides given by 

 Stebbing, except that the gnathopods can hardly be called slender. From Mr. 

 Walker's description my specimens differ in the following points : (1.) The hind 

 margin of the third pleon segment is almost straight (not convex) ; the posterior 

 angle forms a right angle and is not produced into a small tooth, but the minute 

 denticle or seta is present above it. (2.) The eyes are not visible. (3.) The first 

 maxilla has the inner plate fringed with numerous setae, about eighteen or twenty — 

 not seven, as described by Walker. (4.) The telson is deeply cleft, each portion 

 narrowing distally and with the posterior end rounded ; the outer margin bears 



