Cuir Trox.— Additions to the New Zealand Crustacea. 75 
radiata. It affords a very good example of protective resemblance, for the 
body being very flat and of a brown colour can scarcely be distinguished 
from the seaweed, to which it closely adheres. It has several appliances 
which enable it to cling tightly to the seaweed ; in the first place all the 
legs are furnished at the ends with powerful hooked claws, then on the 
under side of the basal joint of last pair of pleopoda and round the proximal 
edge of the outer branch are strong hooked sete, and besides this, on the 
basal joints of all the legs, on some parts of the under surface of the head 
and in one or two other places, are small projections of the integument 
which may possibly be hooked setw, though their nature is not very 
apparent, but which certainly appear to have the same function. They 
are shown on the basal joints of the legs in fig. 5 d and f. 
In the mouth parts the maxillipedes appear to have the same form as in 
Spheroma, etc., consisting of a long slender basal portion bearing an ap- 
pendage of four joints, none of which is produced into a lobe at the distal 
end. The maxille I have not made out satisfactorily. The mandible is 
long and slender and has a sharp cutting edge of four teeth, and below two 
sete with stout bases. There is no appendage unless a rounded protuber- 
ance on the mandible itself is to be regarded as such (fig. 5 ¢). 
The branchial plates—pleopoda—rest in a slight hollow formed by the 
arching of the abdomen. There appear to be two distinct kinds, the first 
(fig. 5 g) consists of a short basal joint bearing two long subequal joints, 
each of which bears several long plumose sets; in the second (fig. 5 h) the 
basal joint is about twice as broad as long, the inner branch is short and 
triangular, the inner edge straight and the outer one slightly curved, it has 
no sete except a few exceedingly delicate ones along the inner edge ; the 
outer branch is of the same length as the inner, and is curved so as to fit 
along the curved outer edge of the inner branch, it bears short plumose sete 
along its outer edge, these start about half-way along the joint, and are at 
first very small, but gradually increase in size till the end where they are 
largest. 
When viewed from above the last pair of pleopoda appears to be articu- 
lated on to the abdomen at its posterior edge, but when seen from below it 
will be found that the basal joint extends anteriorly along the under side of 
the abdomen, and no doubt belongs as usual to the sixth segment of pleon, 
which is, together with the others, completely united to the terminal one or 
telson. 
At the end of the abdomen, in the centre, there is a small opening 
- formed by the posterior edge of the abdomen being slightly arched and thus 
raised a little above the inner branch of the last pleopod ; at this opening is 
a kind of strainer formed by setz on the posterior edge of the abdomen and 
