Archive image from page 391 of Discovery reports (1932) Discovery reports discoveryreports06inst Year: 1932 294 DISCOVERY REPORTS ends of wisps ending just below ectosome; little or no spongin; megascleres subtylo- styli, occasionally almost stylote, 0-165 by 0-003 mm.; microscleres blunt-ended toxa, 0-07 by 0-002 mm. 0 Fig. 19. Arenochalina incrustans, a, section at right angles to surface, showing 'nests' of toxa at centre, x 36; 6, subtylostyle, x 500; c, toxon, X 500; d, base of subtylostyle, very much enlarged, to show relative size of axial canal. Remarks. The species is evide
Archive image from page 391 of Discovery reports (1932) Discovery reports discoveryreports06inst Year: 1932 294 DISCOVERY REPORTS ends of wisps ending just below ectosome; little or no spongin; megascleres subtylo- styli, occasionally almost stylote, 0-165 by 0-003 mm.; microscleres blunt-ended toxa, 0-07 by 0-002 mm. 0 Fig. 19. Arenochalina incrustans, a, section at right angles to surface, showing 'nests' of toxa at centre, x 36; 6, subtylostyle, x 500; c, toxon, X 500; d, base of subtylostyle, very much enlarged, to show relative size of axial canal. Remarks. The species is evidently a degenerate Mycale but whether it represents a species in which the spiculation has become permanently degenerate, or whether it is an individual, with skeleton pathologically affected, of a species with more normal spiculation, it is impossible to say. At all events, the major part of a megasclere consists of the axial canal (Fig. 19 d). The toxa are not distributed evenly throughout the tissues, as is usual, but are found in 'nests' (Fig. 19 a). Genus Acanthorhabdus, Burton Acanthorhabdus fragilis, Burton. , Burton, 1929, p. 432, pi. iv, fig. 2, text-fig. 5. Occurrence. St. 170: Clarence Island, 342 m. Distribution. Victoria Land.
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