The echinus itself is decorated with an egg-and-dartmotif.
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The echinus is convex and the abacus is square.
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The Tuscan order is characterized by an unfluted shaft and a capital that only consist of an echinus and an abacus.
From the en.wikipedia.org
The echinus lies atop the necking.
From the en.wikipedia.org
The composite order volutes are larger, however, and the composite order also has echinus molding with egg-and-dart ornamentation between the volutes.
From the en.wikipedia.org
In the Doric order, the capital consists of a circular torus bulge, originally very flat, the so-called echinus, and a square slab, the abacus.
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The echinus of Ionic columns is decorated with an egg-and-dart band followed by a sculpted pillow forming two volutes, supporting a thin abacus.
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The Doric order is recognised by its capital, of which the echinus is like a circular cushion rising from the top of the column to the square abacus on which ress the lintels.
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The echinus appears flat and splayed in early examples, deeper and with greater curve in later, more refined examples, and smaller and straight-sided in Hellenistc examples.
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More examples
Ovolo molding between the shaft and the abacus of a Doric column
Echinus is a genus of sea urchins.
A convex molding just below the abacus of a Doric capital.
A convex projecting moulding near the top of a capital.