. The Earth beneath the sea : History . Fig. 1. Representative sheaths and spicules. A. Green and red algae that have fragile sheaths of calcium carbonate. Left to right: Galaxaura sp., Udotea sp., three specimens of Penicillus sp. and Ehipocephalus sp. B. Negative print of a thin section of Penicillus sp. The large rings are cross-sections of the stem (see Fig. lA), and the smaller ones are cross-sections of the filaments. C. Electron micrograph of a shadowed carbon replica of the aragonite needles from the stem of Penicillus sp. The crystals are pseudo-hexagonal twins of aragonite. Crystals
. The Earth beneath the sea : History . Fig. 1. Representative sheaths and spicules. A. Green and red algae that have fragile sheaths of calcium carbonate. Left to right: Galaxaura sp., Udotea sp., three specimens of Penicillus sp. and Ehipocephalus sp. B. Negative print of a thin section of Penicillus sp. The large rings are cross-sections of the stem (see Fig. lA), and the smaller ones are cross-sections of the filaments. C. Electron micrograph of a shadowed carbon replica of the aragonite needles from the stem of Penicillus sp. The crystals are pseudo-hexagonal twins of aragonite. Crystals similar to these are reported from the sediments west of Andros (Lowenstam, 1955). D. A specimen of the common Florida sea fan (alcyonarian), Rhipidigorgia flabellunu and its calcite spicules.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
