. mm Text-fig. 23. Cystodytes dellechiajei (Delia Valle): A, spicules of f. antarctica (St. 190); B, spicules of typical form (St. 934); C, spicules of typical form (St. WS 871) any collected by the second Charcot Expedition or the Swedish Antarctic Expedition of 1901-3, the only two expeditions which have hitherto taken the form. The disc-shaped spicules (Text-fig. 23 A), which reach 0-3 mm. in diameter, have a crenelated margin, as described by Arnback (1950).

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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti