Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
HARPER CRAB, n.comb. A species of long-clawed crab (Fif. 1710 R. Sibbald Fif. and Knr. 55), thought to be Corystes cassivelaunus (Id. (1803) 132).
[Phs. because of the posture adopted by this crab like that of one seated at a harp.]