definition
A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane. For example the umbo in the integument of the larvæ of echinoderms or in the tympanic membrane of the ear.
definition
One of the lateral prominences just above the hinge of a bivalve shell.
definition
A bump or protrusion on the top of the cap.
definition
The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
Solenopsidae.-Shell equivalve, greatly elongated, umbones very far forward.
The young Brachiopod in all its species is protected by an embryonic shell called the " protegulum," which sometimes persists in the umbones of the adult shells but is more usually worn off.
Hinge pliodont, that is to say, it has numerous teeth on either side of the umbones and the teeth are perpendicular to the edge.
Philobryidae.-Shell thin, very inequilateral, anterior part atrophied, umbones projecting.
Trigonia; shell sub-triangular, umbones directed backwards.
Prasinidae.-Shell inequilateral, with anterior umbones and prominent anterior auricula; cardinal border arched..
Isocardiidae.-Mantle largely closed, pedal orifice small; gill-plates of equal size; shell globular, with prominent and coiled umbones.
Chamidae.-Shell with sub-equal valves and prominent umbones more or less spirally coiled; ligament external.
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