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The Holothurian Fauna of Cook Strait, New Zealand

Plate VI.—Heterothyone alba (Hutton).—Fig. 1, internal anatomy of adults; fig. 2, buttons; fig. 3, tentacle deposits; fig. 4, pharynx and calcareous ring; fig. 5, scales from the skin (in outline only); fig. 6, cups; fig. 7, surface features of a scale; fig. 8, genital tubule packed with eggs

Plate VI.—Heterothyone alba (Hutton).—Fig. 1, internal anatomy of adults; fig. 2, buttons; fig. 3, tentacle deposits; fig. 4, pharynx and calcareous ring; fig. 5, scales from the skin (in outline only); fig. 6, cups; fig. 7, surface features of a scale; fig. 8, genital tubule packed with eggs.

Plate VI.—Heterothyone alba (Hutton).—Fig. 1, internal anatomy of adults; fig. 2, buttons; fig. 3, tentacle deposits; fig. 4, pharynx and calcareous ring; fig. 5, scales from the skin (in outline only); fig. 6, cups; fig. 7, surface features of a scale; fig. 8, genital tubule packed with eggs.

Abbreviations: an., anus; a.p.r., anterior process of radial; c.r., calcareous ring; g.d., genital duct; g.tub., genital tubule; int., intestine; ir.p., interradial piece; l.resp., left respiratory tree; mad., madreporite; mad.d., stone canal; m.f., muscle fibres; oes., oesophagus; ped., pedicel; ph., pharynx; p.p.r., posterior process of radial; P.v., Polian vesicle; re., rectum; r.m., retractor muscle; r.resp., right respiratory tree; r.v., ring vessel; v.t.f., ventral tubefoot.