Discovery reports (1962) Discovery reports discoveryreports31inst Year: 1962 THE APPENDAGES, THEIR INTERRELATION AND FUNCTION 315 which links the body of the animal with its carapace (Fig. 2, tnx2). In this position the vertical flattened epipod, in the form of a vibratory plate, extends outwards towards the carapace. Plumose setae, arranged in three groups, extend from the margin of this epipod. At the apex of the protopod is the large anteriorly directed endite-like structure, which, as already mentioned, is probably the endo- pod of the appendage. This bears at its apex a group of three p
Discovery reports (1962) Discovery reports discoveryreports31inst Year: 1962 THE APPENDAGES, THEIR INTERRELATION AND FUNCTION 315 which links the body of the animal with its carapace (Fig. 2, tnx2). In this position the vertical flattened epipod, in the form of a vibratory plate, extends outwards towards the carapace. Plumose setae, arranged in three groups, extend from the margin of this epipod. At the apex of the protopod is the large anteriorly directed endite-like structure, which, as already mentioned, is probably the endo- pod of the appendage. This bears at its apex a group of three pectinate claw-setae, which curve inwards and slightly backwards (Fig. 10). Dorsally and externally to them are three moderately long, anteriorly directed brush-setae. The setae of the endopod may be directed towards the apical claws of the maxillularly palp, but forward movement of the shaft of the maxilla brings them into the region of the distal endites of the maxillule. A degree of ventral extension of the endopod is also possible. Proximal to the endopod, there are on the shaft of the maxilla two groups of setae, borne on slight prominences, which probably represent endites. There are three setae in thedistal group, a long outer brush-seta, a median brush-seta of about half its length and an extremely short inner seta. The more 02 mm Fig. 11. C. borealis antipoda. Right maxilla from inside, en, endopod; ep, epipod; ex, exopod; p, protopod. proximal group consists of a brush-seta of about the same length as the longest in the distal group and a much shorter seta. The setae in these two groups are directed towards the distal endites of the maxillule, though their position varies with movement of the shaft and they can be directed more dorsally towards the proximal maxillulary endites. The exopod (Figs. 7, 10 and n) is divided into three articles. The first two of these are long, the terminal very short. The articulation of this ramus is slightly to the outside of the dista
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