mītŭlus and mȳtŭlus (mȳtĭlus), n, m., = μύτυλος,
a kind of mussel, seamussel , Plin. 9, 51, 74, § 160; 32, 9, 36, § 111; also, mutulus, Cato R. R. 158; Hor. S. 2, 4, 28.
mītulus ī, m , μίτυλος, an edible mussel, H. ...
An Elementary Latin Dictionary