Munna from New Zealand. 11 
tion, the protopodite, which bears an inner, flat, rectangular, 
branchial plate, the endopodite, which narrows slightly towards 
the distal end and bears at its extremity three long, delicately 
plumose sete; the outer part of the appendage, the eopo- 
dite, is not separated at the base from the protopodite; it 
consists of two joints, the first rectangular, bulging a little 
distally on the inner side, the second subtriangular, bearing 
a few small sete at the extremity and three longer ones on 
the outer margin; the outer margin of both joints is also 
closely fringed with very fine short sete. 
The fourth and fifth pleopoda I have not been able to sepa- 
rate out quite satisfactorily, but they appear to consist of 
rounded branchial plates with margins quite free from sete. 
Among the other parts I found the appendage represented in 
figure 14 of Plate II. This I believe to be the exopodite of 
the fourth pair of pleopoda; it is somewhat similar to the 
exopodite of the third pair, but narrower and more delicate ; 
the basal portion is long and curves slightly outwards, the 
whole of its outer margin is finely crenated and fringed with 
very delicate sete, which project radially outwards at each 
crenation ; the second joint is subtriangular, joined to the 
first by an oblique articulation; it has the outer margin 
fringed with fine sete and bears at the end two very long, 
delicately plumose sete longer than the joint itself. 
In the female the first pair of pleopoda (fig. 11 a) have been 
modified to form an oval operculum, which is only slightly 
longer than the greatest breadth ; it consists of a single piece 
without any suture or other mark showing the different parts 
of which it is composed; the extremity, which is nearly 
straight, bears six or seven very small fine sete. 
The other pleopoda of the female, with the exception of 
course of the second, appear quite similar to those of the male. 
The uropoda (Plate LL. fig. 15) are very small, conical, and 
bear a few small sete. They are the same in both sexes. 
Sexual differences.—In no point do we find so much variety 
as in the characters by which the female differs from the male 
among the Crustacea. These differences are found some- 
times in one part of the body and sometimes in another, and 
the parts affected are often different in closely allied species. 
In the present species the female differs from the male in the 
following points:—(1) In the character of the first pair of 
legs; (2) in the absence of the woolly hairs found on the 
carpus of the fifth, sixth, and seventh pairs of legs in the 
male; (3) in the special modifications of the pleopoda. 
