Crustacea.'\ 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



629 



Fig. 3. — Aiyloides aiicldandicus, Walker. 



.3rt. First gnathopod of female (outer side). 

 36. Second gnathopod of female (outer side). 



about five or six small setae, one or two being situated at the rounded end ; in Mr. 

 Walker's specimens each half bears only two setae. 



The fiagella of both antennae bear calceoli on the proximal joints. The gnatho- 

 pods are described below and shown in the figures, and the rest of the animal calls 

 for no further detailed description. 



Figure 3a shows the first gnathopod. The side plate is slightly narrowed and 

 rounded below, the margin bearing two or three fine setae ; the basos is as long 

 as the rest of the limb, its posterior margin bears five or six very long setae ; the 

 ischium has a small tuft of 

 setae on its posterior mar- 

 gin near the extremity ; 

 the merus is rounded pos- 

 teriorly, and bears near its 

 angle a transverse row of 

 eight or nine stout setae, 

 with others on its posterior 

 margin towards the end of 

 the joint. The carpus is 

 rather longer than the pro- 

 pod, its anterior margin with 

 two or three setae and a 

 small tuft at the distal 

 angle ; the posterior margin 

 bears three transverse rows 

 of setae, the number in each row increasing towards the distal end of the joint ; 

 the propod is oblong, the breadth more than half its length ; anterior margin rather 

 convex, with a few setae on the distal half, and a tuft at the base of the finger ; 

 posterior margin with three short transverse rows of setae similar to those on the 

 carpus, and a small tuft on the outer surface some distance from the margin ; the 

 palm is transverse, straight, and bears four short stout setae near the point where the 

 tip of the finger impinges ; the finger is nearly straight, and fits closely on to the palm. 



The second gnathopod (fig. 36) is similar to the first, but slightly larger ; the 

 carpus is fully as long as the propod, and bears on its posterior margin four transverse 

 rows of setae, and there are also four rows on the posterior margin of the propod. 



Mr. 0. A. Sayce has described two species of Atyloides from the fresh waters 

 of Victoria. Of one of these, A. gabrieli, I have been able to examine specimens 

 kindly sent me by Mr. Sayce. It comes close to the species now under discussion, 

 which, however, differs in the following points : The antennae bear fewer and smaller 

 tufts of long hairs than those found in A. gabrieli ; the inner lobe of the first maxilla 

 bears numerous plumose setae, instead of only three ; the second joint of the palp 

 of the mandible is less broadened ; the gnathopods are rather less slender, and ap- 

 parently have the posterior margin of the fifth joint less produced ; and the palm 

 is considerably more transverse than in A. gabrieli. 



Mr. Sayce has also described another species, A. fontana, which, in some of these 

 points approaches more nearly to the one from Auckland Islands, for the antennae 

 do not bear the tufts of long setae, the second joint of the palp of the mandible 

 is less expanded, and the inner lobe of the first maxillae bears numerous setae. 



