iy 
ANCEUS MAXILLARIS, 191 
inner apical angle produced into a slender elongated 
process, followed by four joints attached together 
obliquely, with a strong coating of bristles directed 
obliquely backwards along their outer margin. The first 
and second free segments of the body are about the same 
width as the head, short, transverse, with the sides rather 
rounded and dilated; the three following segments are 
somewhat narrowed, longer, much more irregular, and 
less distinctly separated from each other than the anterior 
segments, and with the lateral margins rounded and 
directed somewhat backwards. ‘There is a small short 
transverse piece in the middle between the last segment 
of the body (pereion) and the first segment of the tail 
(pleon). The pleon is about equal to two-thirds of the 
length of the head, and consists of five transverse seg- 
ments, followed by a triangular central terminal plate, 
each segment being furnished on each side beneath with 
two pairs of very delicate, strongly ciliated, branchial 
scales. The tail (pleon) is not half the width of the 
hind part of the body. The legs are of moderate length 
and rather robust, with some small tubercles on the inner 
margin of the middle joints. 
The female, in its fully developed gravid state, as 
represented in the following page, is a little longer than 
the male, and has the body greatly swollen with eggs, or 
young ; the head, anterior segments of the body, and tail 
being small, and marked all over with minute dark points. 
The head is subtriangular, without any appearance of the 
immense jaws of the male (of which, indeed, we have not 
found the slightest vestige). The upper antenne are 
small, and consist of a short basal joint, followed by two 
nearly equal longer joints, and a short and slender ter- 
minal flagellum. The lower antennz are much stronger 
and longer than the upper, and consist of two strong 
i] 
