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Zoology Publications from Victoria University of Wellington—Nos. 58 to 61

Plate 1

Plate 1page 21

Plate 1

Fig. 1: The column body wall of I. olivacea. A transverse section stained by the Mallory/Azan technique, × 460.

C, muscle fibre; EC, ectoderm; EN, endoderm; M, mesogloea; N, ectodermal nerve net; arrows show mesogloeal cells.

Fig. 2: Supporting cell from the ectoderm of the column. Dissociation preparation photographed by phase contrast illumination, × 620. N, nucleus; P, projection.

Fig. 3: Transverse section of the column showing the outer region of the ectoderm. Heidenhain's iron haematoxylin/orange G stain, × 930. C, cuticle; P, projections.

Fig. 4: Epitheliomuscular cell from the endoderm of the column. Dissociation preparation photographed by phase contrast illumination, × 1,100.

C, muscle fibre; F, flagellum; S, cytoplasmic strand connecting muscle fibre to epithelial part of cell (Nucleus not showing).

Fig. 5: "Verruco-cinclide" from a transverse section of the column.

Mallory/Azan preparation, × 490.

EC, ectoderm; EN, endoderm; M, mesogloea.

Fig. 6: Transverse section through column body wall showing orientation of mesogloeal fibres. Sulphation toluidine blue stain, × 740.

C, muscle fibre; EC, ectoderm; M, mesogloea.