Decorations were distributed with some variation, and Ionic entablatures often featured formalized bands of motifs.The external frieze often contained a continuous band of figurative sculpture of ornament, though this was not always the case.
Given the similariteis of the Temple of Poseidon to the Hephaisteion and the temple of Nemesis in Rhamnous, many historians have concluded that they were designed by the same architect.
One particularly unifying feature of all three temples is the fact that the columns of the porch were aligned with the third column of the peristyle.
The cushion placed on top of the column is similarly shaped to that of the Doric Order, but is decorated with a stylized ornament and surmounted by a horizontal band that scrolls under to either side.
Ionic Order columns are fluted with narrow, shallow flutes that do not meet at a sharp edge, but have a flat band between them.
The usual number of flutes is 24, but there can be as many as 44.
The architrave is not always decorated, but more often it rises in three outwardly-stepped bands.
The temple of Poseidon was a peripteral building of the Doric order, made of marble from nearby Agrileza, with six columns at its ends and thirteen on each long side for a total of 34--of which thirteen survive today.
Four of the north columns were reconstructed in the late 1950's.
Initially the Corinthian Order was used internally in such sites as the Temple of Apollo Epicurius at Bassae.