From ZooTerms (Dictionary of Invertebrate Zoology)
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fasciole (noun; Latin diminutive fascia, bundle): 1. (Cnidaria: Echinoidea) In Spatangidae, a small band of minute spine-bearing tubercles used to produce water currents in the burrow for feeding, respiration and excretion.

2. (Mollusca: Gastropoda) A spiral band formed by the successive growth lines on the edges of a canal.