. Fig. 4. C. borealis antipoda. A, transverse section through labrum and mandibular basis showing distal articular process of coxa in labral socket; B, right mandibular coxa and part of basis from inside, ax, dorsal articular condyle of coxa; , distal articular process of condyle; , anteroposterior labral muscle; b, basis; , articular surface of basis and coxa; , in- cisor edge of basis; c, coxa; , incisor edge of coxa; fl, anterior dorsal flange of coxa; , posterior labral gland; , wall of labral socket. Labrum (Figs. 2, 4, 7, 8, 10) The labrum is well developed and

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. Fig. 4. C. borealis antipoda. A, transverse section through labrum and mandibular basis showing distal articular process of coxa in labral socket; B, right mandibular coxa and part of basis from inside, ax, dorsal articular condyle of coxa; , distal articular process of condyle; , anteroposterior labral muscle; b, basis; , articular surface of basis and coxa; , in- cisor edge of basis; c, coxa; , incisor edge of coxa; fl, anterior dorsal flange of coxa; , posterior labral gland; , wall of labral socket. Labrum (Figs. 2, 4, 7, 8, 10) The labrum is well developed and filled with gland-cells. It is usually described as being helmet- shaped. In section, its ventral surface is flattened and its dorsal surface rounded (Fig. 4 A). It arises

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