Sǽ-cocc

According to the Old English Dictionary:

es;

sǽ-cocc

m. A cockle :-- Hwæt féhst ðú on sǽ? Crabban muslan sǽcoccas cancros, musculos, neptigallos, Coll. Monast. Th. 24, 11. [Cf. a farthing-worth of muscles were a feste for suche folke, oþer so fele Cockes (cokkys, MS. G. : cokeles, MS. I.), Piers P. C text x. 95. Welsh cocs cockles.] sæ-cocc