Species within a genus

modius = the roman corn measure, a measure, peck; the socket, step, shoe in which the mast of a ship stands;
-olus, = diminutive.
modiolus, = a small measure; hence a kind of drinking vessel; a bucket on a water-wheel; the nave of a wheel.
(modiolus, = The cenral bony column in the cochlea of he ear: = allusion unclear)
(ld, BL, Le)