The two series meet at the umbo with a group of four to five orthomorphic teeth.
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The cone scales have a flat to pyramidal apophysis, with a small prickle on the umbo.
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But at the umbo, a sensor known as an accelerometer is attached to detect the vibration.
From the sciencedaily.com
There is sometimes a broad umbo, and in older specimens, the cap is depressed in the centre.
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The ligament is straight with an umbo which is central to subcentral.
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The package is glued to the umbo so the accelerometer vibrates in response to eardrum vibrations.
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The teeth have a concavity in the chevron which faces away from the center of the hinge and the umbo.
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An umbo is a knobby protrusion at the center of the cap.
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In both Concavodonta and Emiliodonta both the anterior and posterior rows of teeth in the shell face outwards away from the umbo.
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More examples
A slight rounded elevation where the malleus attaches to the eardrum
An umbo is a raised area in the center of a mushroom cap. Caps that possess this feature are called umbonate. Umbos that are sharply pointed are called acute, while those that are more rounded are broadly umbonate. ...
The inflated dorsal part of the shell; also called the beak
A knob-like limb arising from the surface of an oyster shell, near the hinge. Often refers to the anterior or hinge end of the oyster.
A knob or boss, more coarse than an apiculum.
Of the pileus: A raised, conical to convex knob or mound on the center. (17)
Literally diskus or mamilla, an abruptly raised conical, grooved or depressed, generally waxy structure within the pappus at the achene apex, e.g. in Tyrimnus, Jurinea (tribe Cardueae).
A rounded protuberance on both faces of some seeds in the Mimosoideae, such as those of Prosopis.
A conical projection from the surface. This is the name of the "hump" on the shells(valves) of many bivalves(clams, mussels, etc...).