120 BR. L. A. BORRADAILE ON THE 
the presence, on the anterior side, of a rod-like sclerite, which runs across it 
and at its median end expands into the stout cuticle of a large, subpyramidal 
endite. The apex of this ondite is directed dorsally, towards the mouth, and 
that side of it which is opposed to the sternum forms a facet, above the 
membranous attachment of the limb. At its outer end, the transverse sclerite 
articulates with the stout cuticle at the base of the epipodite, and that in turn 
makes articulation by means of a hard process with the epimerite. I have 
net been able to find a true arficulation on the inner side of the limb. The 
epipodite, which lies outside the gills, is much expanded at its proximal end, 
especially in a triangular forward lobe. A strong tendon runs along it. 
The basipodite is represented by a soft region distal to the coxa. It bears on 
the median side a large^ flat, forwardly projecting endite or lacinia, which 
has a curved outer and a straight' median edge, and is a little concave 
dorsally (anteriorly), so as to fit over the surface of the mandible. Distally 
the basis bears the exopodite, which i-esembles that of the second maxilliped, 
and the endopodite, which consists of an unjointed shaft, flattened in a plane 
which faces obliquely outward and inward, with a triangular distal expansion, 
flattened in an almost horizontal plane and separated from the shaft by a not 
very flexible suture. This expansion completes in front the exhalent channel 
of the gill-chamber. Its median edge is turned ventrally and lies against 
the anterior side of the mandible. 
The limb is outlined with stout cuticle, which also passes along the sutures 
between the protopodite and the exopodite. endopodite, and endites. Its 
relation to the sternal and epimeral regions resembles that of the second 
maxilliped, but at the base of the epipodite there lies, as has been men- 
tioned, a rather ill-developed articulation, which is not present in the limb 
behind it. 
A row of long, flexible Jiairs follows the outer edge of the exopodite, the 
distal and inner edges of the endopodite, and the outer edge of the large 
endite. On the inner edge of this endite the hairs are more numerous, 
shorter, and rather stouter. The proximal endite is covered with long hairs, 
all directed towards the mouth. On the exopodite, the inner edge of the 
endopodite, and the outer edge of the large endite the hairs are feathered. 
Flexor and extensor muscles of the coxa move the limb as a whole. The 
exopodite has a musculature like that of the third maxilliped, and the 
endites have muscles of their own. The epipodite has a system of three 
powerful muscles. 
The limb can be moved to and from the middle line of the body, doubtless 
by means of the muscles of the coxa. In moving outwards it also travels a 
little backwards. The large endite makes independent movements, rotating 
forward-outwards and inward-backwards and thus with its edge describing 
an ellipse. Usually it moves inward-backwards towards the mouth when 
the rest of the limb is rotating outward-back wards, and thus the smaller 
