Cuitton.—On some Subterranean Crustacea. 91 
has a tuft of sete 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 remarkable; the last 
three are abundantly covered with long stout sete (see fig. 11); in all the 
dactylos is slender and the end forms a distinct claw having sete 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 sete 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 sete and 
bearing at the end another small joint fringed with plumose sete (fig. 13). 
The sixth segment of pleon is united to the telson, its inferior edge 
bears four strong slightly curved sets. 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 setze, 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 sete 
and longer fine hairs (fig. 14). 
Throughout the whole of the body and the appendages the integument 
is covered with very- short sete arranged more or less regularly in inter- 
rupted rows. These sete are very small and can scarcely be seen without 
a 1-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 antenne 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 Anthuride with the Idoteidz. In the long abdomen com- 
posed of separate segments it differs both from the Anthuride and the 
