Chilton.— On some Subterranean Crustacea. 91 



has a tuft of setae on the inner edge, the propodos is not very large ; in 

 the centre of the palm are a few short hairs set on the tip of small teeth- 

 like projections. The other legs present nothing remarkahle ; the last 

 three are abundantly covered with long stout setae (see fig. 11) ; in all the 

 dactylos is slender and the end forms a distinct claw having setas arising at 

 its base (fig. 11a). 



In the pleon a somewhat remarkable feature is presented by the seg- 

 ments (except the first) having the integument produced downwards as in 

 the first three segments of the pleon in Amphipoda, thus forming lateral 

 shields protecting the pleopoda. The first pair of pleopoda differs from the 

 others ; it consists of a small basal joint bearing two oblong plates, the 

 large one having a few setae at the end (fig 12). It appears to form an 

 imperfect operculum for the other pleopoda. In the others there is a basal 

 joint as before ; from this spring two lobes, the smaller oval with margin 

 entire, the larger sub-oblong, inner edge fringed with simple setae and 

 bearing at the end another small joint fringed with plumose setae (fig. 13). 



The sixth segment of pleon is united to the telson, its inferior edge 

 bears four strong slightly curved setae. The sixth pleopod is more like one 

 of the last three pairs of pleopoda in Amphipoda than anything I know of 

 among the Isopoda ; the upper surface of the peduncle is broad and slightly 

 concave, the outer upper edge fringed with setae, while the inner upper edge 

 is straight. At the end of the peduncle there is one strong seta below and 

 two or three above, the rami are sharply pointed and bear both stout setae 

 and longer fine hairs (fig. 11). 



Throughout the whole of the body and the appendages the integument 

 is covered with very short setae arranged more or less regularly in inter- 

 rupted rows. These setae are very small and can scarcely be seen without 

 a J-in. objective (fig. 15). Besides this along the dorsal surface are scattered 

 a few long fine hairs. 



The alimentary canal is generally full of black matter of some kind, — 

 food, I suppose, — and hence can be readily seen through the transparent 

 integument. It is shown in fig. 1. 



The animal I have thus described is interesting and important, because 

 it combines characters belonging to different groups. In the elongated 

 form of the body, in the antennae and in the plate at the base of the maxilli- 

 pede, it resembles Idotea, it differs very much from this genus, however, 

 in the form of the abdomen and in the fact that the mandible has an 

 appendage. In this latter respect and in the cylindrical elongate body it 

 resembles Anthura and Paranthura, and it thus to a certain extent serves 

 to connect the Anthurida; with the Idoteida. In the long abdomen com- 

 posed of separate segments it differs both from the Anthurida, and the 



