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Hyalonema
- - A genus of hexactinelline sponges, having a long stem composed of very long, slender, transparent, siliceous fibres twisted together like the strands of a color. The stem of the Japanese species (Hyalonema Sieboldii), called glass-rope, has long been in use as an ornament. See Glass-rope.
Hyalotype
- - A photographic picture copied from the negative on glass; a photographic transparency.