. 0'5 mm Fig. 7. C. borealis antipoda. Mouth and first trunk appendages viewed from mid-line; caudal furca in front of tips of trunk appendages shown in outline; armature of setae omitted, , mandibular basis (gnathobase); , mandibular exopod (mammiliform appendage); , mandibular palp (endopod); mxl p, palp of maxillule; mx2en, maxillary endopod; mx2ex, maxillary exopod; trxex, exopod of first trunk limb. seta arises near the apex of the proximal article. The posterior margin bears a further series of setae. There are two long pectinate setae of the same form as the long anterior o
. 0'5 mm Fig. 7. C. borealis antipoda. Mouth and first trunk appendages viewed from mid-line; caudal furca in front of tips of trunk appendages shown in outline; armature of setae omitted, , mandibular basis (gnathobase); , mandibular exopod (mammiliform appendage); , mandibular palp (endopod); mxl p, palp of maxillule; mx2en, maxillary endopod; mx2ex, maxillary exopod; trxex, exopod of first trunk limb. seta arises near the apex of the proximal article. The posterior margin bears a further series of setae. There are two long pectinate setae of the same form as the long anterior one. The first of these arises near the distal end of the middle article and the other from a similar position on the proximal article. Both reach to near the apex of the shorter terminal claw. The middle article bears a shorter fine seta on its posterior distal margin and the proximal article three similar short fine setae distributed along the distal half of the posterior margin. All the finer setae bear fine secondary setules. The articulation of the proximal article of the palp with the basis is provided with lateral cuticular facets which limit its movement to a dorso-ventral direction. The limits of movement allowed by the articulation would seem to be from a position where the proximal article is directed nearly vertically upward from the basis to one with it directed vertically downward. The second and third articles can be extended straight in line with the proximal article or flexed toward the body. The articulation of the articles in series is such that the palp can be extended upwards and outwards, with the terminal claws near the antennal notch of the carapace, or folded downwards and inwards. Due to a slight diagonal setting of the articulation between the basale and the proximal article of the palp, the downward and inward movement is accompanied by a rotation of the palp about its axis, in such a fashion that the
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
