Seal Of Lutellaria

(if referring to a bivalve mollusk genus)

Same issue: no historical seal. Could you mean — i.e., a seal matrix carved from Lutraria shell? That would be unusual but possible in some archaeological contexts (e.g., Viking or Celtic shell seals). seal of lutellaria

The (English gentry) had a famous Luttrell Psalter (14th c.), and their heraldic seal exists. (if referring to a bivalve mollusk genus) Same

I notice you’ve written — this doesn’t match any known historical, archaeological, or zoological term. It may be a misspelling or confusion between several possible terms. seal of lutellaria