. Fig. II. Hemigellius pachyderma, a, section at right angles to surface, showing structure of main skeleton, x 30; b, oxeote, x 400. over surface; pores apparently evenly distributed; subdermal cavities large; colour, in spirit, greyish yellow; skeleton a reticulation consisting of stout spicule bundles, 5-7 spicules thick, running towards surface and anastomosing slightly, connected by isolated spicules set at varying angles; main vertical fibres ending immediately beneath surface in a dense subdermal palisade; oxea slightly curved, measuring 0-28 by o-oi4mm.

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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti