MR. L. A. BORRADAILE ON THE 



a bristly knob which is perhaps an endite. The exopodite is 

 obscurely annulate, and at its end there are usually a few longer 

 segments which are sometimes true joints, but in other cases 

 appear to be marked merely by a change in the width of the 

 organ and the attachment of bristles. The ischiomeropodite is 

 almost always more or less curved, with the concave side towards 

 the middle line of the body. It is ribbon-like and shows in the 

 Pontoniinse a tendency to widen. The curving of this joint 

 brings the last two joints near to those of the fellow limb, so 



Text-fiffure 51. 



Z.mxp. 



1. mxp. 



i Venlval view of mouth-region of Z,eander serratus, all month-parts 

 being in place. 



that, wliile the ischiomeropodites lie at the sides of the mouth 

 with a wide gap between them in which the second ma.xillipeds 

 are exposed, the distal parts.of the limbs lie side by side in front 

 of the mouth-region. A further complexity in the arrangement 

 of the parts of the limb is brought about by the fact that the 

 ischiomeropodites are twisted, so that the flat surface of the 

 appendage, which in its distal part is in a horizontal plane, is in 

 the proximal part in a plane between the horizontal and the 



