Sentence:  All the other <WSD>furbelows</WSD>, and portions of this one[this Medusa] that lay below the expansion, floated as usual through the water, except that on some occasions an accessory power was obtained by pressing a portion of another <WSD>furbelow</WSD> to the side of the glass and making it adhere just like the portion that was exposed to the surface of the air. 
Meaning of the word marked with <WSD> tags:  A frill, flounce, or ruffle, as on clothing; a decorative piece of fabric, especially one gathered or pleated as into a ruffle, etc.