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Webster's Dictionary (1865)

Scyl-lā'ri-an, n.

noun

n. (Zool.) One of a tribe of macrourous decapod crustaceans, remarkable for the singular conformation of their external antennæ. Eng. Cyc.

An engraving of a scyllarian crustacean viewed from above, with its broad flattened body and long antennae visible.
Scyllarian (Ibacus Peronii).