. 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 consist
. 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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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
