Sǽ-scill

According to the Old English Dictionary:

sǽ-scill

a sea-shell :-- Hé wæs nacod and on carcern onsænded, and þǽr wæs understregd mid sǽscellum and mid scearpum stánum (cf. mittitur in carcerem ubi . . . fragmenta testarum subter eum sternebantur, Bede's Life of Felix), Shrn. 51, 13. sæ-scill