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

Plate 2

Plate 2page 23

Plate 2

Fig. 1: Longitudinal section of hydranth body wall. Specimen fixed in Formol/Calcium, stained with Mallory/Azan. Nerve cells (arrowed) show clearly. Note cuticle, and densely staining food vacuoles in endoderm. × 1,100.

C, cuticle; EC, ectoderm; EN, endoderm.

Fig. 2: Region of ectoderm adjacent to that shown in Pl. 2, Fig. 1, from the same preparation. Note hair like processes extending from sensory cell, × 1,650.

EC, ectoderm; M, mesogloea; S, sensory cell.

Figs. 3A, 3B: Transverse serial sections through body wall of middle hydranth region. Methyl green/pyronin stain, without (A) and with (B) prior RNase digestion, × 1,130.

D, digestive cell; EC, ectoderm; EN, endoderm; M, mesogloea.

Figs. 4A, 4B: Longitudinal serial sections through hypostome. PAS test, with (A) and without (B) prior diastase digestion. Many darkly staining bodies have been removed from the ectoderm and endoderm by diastase digestion. Those remaining represent hypostomal gland cells, × 830.

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

Fig. 5: Longitudinal section of hydrocaulus at hydranth base to show 2-layered structure of perisarc. Mallory/Azan stain, × 1,130.

EC, ectoderm; P1, outer perisarc layer; P2, inner perisarc layer.