159 
truncate — sloping inwards. The end of each is supplied with from 
1 2 to 16 long setae, nearly as long as the lobes themselves. These 
setae curve inwards and have the inner margins supplied with short 
pectinations which project at right angles to the setae. In the 
outer setae on each lobe the pectinations are line and minute, but 
in the inner setae they are much stouter and rounded at the end. 
There is a tuft of tine setae on the outer side of the basal portion, 
at the point where the outer lobe articulates with it. The outer 
lobe is slightly concave and overlaps and partially encloses the 
middle lobe, which in its turn overlaps the lobe formed by the 
prolongation of the basal portion. This appendage, like the first 
maxilla is difficult of interpretation, but it appears probably, 
according to the authorities already quoted, that the innermost 
lobe represents the internal lacinia arising from the coxos, and the 
two articulated lobes the internal la&initv arising from the basos. 
The maxillipedes (Plate xxiv., figs. 2, 3, and 4) are large and 
well developed and cover the greater part of the under surface of 
the mouth parts. The basal joint (coxos) is well developed and 
is distinctly marked oil from the succeeding joint the basos, it is 
broader than long, and from its outer distal margin arises a large 
fiat plate representing the epipodite. This tits closely on the 
under surface of the head on each side covering and protecting 
the other mouth parts ; it extends as far forwards as the mandibles. 
In outline it is broadly elliptical, about half as long again as 
broad ; the outer edge bears about eight short setae sparsely 
arranged. The basos is more than twice as long as broad, rectan- 
gular, inner margin quite straight, outer margin curving slightly 
outwards towards the distal end. Prom the inner margin a flat 
plate projects inwards at right angles to the surface of the maxil- 
lipede and this is produced distally a little beyond the end of the 
inner side of the ischios. Only the distal end of this plate can be 
seen when the maxillipede is viewed from below ( i.e . from without) 
but the whole can be readily seen if it is viewed from above (i.e. 
from within), and the plate is bent back upon the rest of the 
maxillipede. This view is shown in Plate xxiv., fig. 3. If the 
plate were left in its natural position when the maxillipede is 
viewed directly from above, only the inner edge of the plate would 
be seen. The end of this plate is truncate and thickly fringed 
with stout set;e, some of them plumose, the inner surface is also 
thickly covered with setae, some of them simple, but the others 
along the margin long and densely plumose. Besides these setae 
there are on the outer edge of its distal portion three strong curved 
setae hooked at the end. These appear to hook into the corres- 
ponding setae on the other side, and to keep the two maxillipedes 
closely together. 
From the outer distal angle of the basos (on its outer surface) 
arise four very long setae directed inwards and reaching nearly to 
the end of the plate already described. The ischios is very short, 
