Cuir Tos.— On the Isopodan Fauna of New Zealand. 147 
but it so evidently belongs to the same group, that I have thought it better 
that the genus should be widened than that matters should be complicated 
by the addition of a new genus. 
In the upper antenna (pl. XVIIL., fig. 2) the basal joint of the peduncle is 
very large, and on the inner side, at about one-third of its length from the 
base, there is a projection (p), the edge of which is crenulated. There is a 
somewhat similar structure in Apseudes talpa, but it is not so well marked. 
The two projections of the two antenne appear to fit with one another and 
form a grasping organ of some kind. The second joint of the peduncle is 
only one-third the length of the first and is slightly expanded distally ; it 
is followed by the third joint, half as long as the second, bearing the two 
flagella. It is, I believe, only in this genus of Isopoda that the upper 
antenna has two flagella, though it is common enough among the Amphi- 
poda. 
The secondary (inner) flagellum is half as long as the primary one, and 
consists of about six joints, the primary flagellum having about fourteen. 
On the primary one several of the joints bear longish simple set, and a 
single auditory cilium at their distal ends (fig. 2 a). 
In the second antenna (pl. XVIIL., fig. 8) four joints can be distinguished 
in the peduncle, possibly there is another joined to the head. From the 
first of these joints there springs a small projection ending in a very long 
seta ; this may possibly correspond to the “ olfactory denticle " of Spence 
Bate, which is so common among the Amphipoda. The last joint of the 
peduncle is about as long as the two preceding together and is followed by 
the flagellum, which contains about eight joints bearing long ciliated sete. 
In other species of Apseudes the inferior antenna bears a small oval squa- 
mose plate on the peduncle, something like that found in the Macroura, 
but I have not been able to find any similar structure in my species. 
The mandible (pl. XVIII., fig. 4) is large and powerful, besides the teeth 
on the fixed portion there are also some on the end of a large piece which 
projects from about the middle and appears to be movable. The appen- 
dage consists of two joints, though there may also be another close down to 
the mandible itself. The second last joint is the longest and bears several 
short sets, the last joint narrows towards thé end and bears several short 
and two or three long sete. 
As I have only had a single specimen I have not been able to make out 
all the mouth-parts satisfactorily ; the one represented in fig. 5 I believe to 
be the second mazilla, or perhaps only part of it. It consists of two pieces, 
one narrows towards the distal end, which bears a crown of strong sete ; 
the other springs as an appendage from the base of the first, it also narrows 
towards the end, this is covered with very short hairs and bears four very 
