Oriscus

LOriscus (obscure origin, to bring closer can be of aboriscor , perish, die) is a note which generally enters the composition of Neume S, in the Gregorian chant.

It is a kind of apostrophe which is placed at the end of certain groups. It does not amalgamate with its precedent.

The oriscus underlines the sequence with the following note, generally lower. In the cursive notation, the oriscus isolated with the shape from a reversed tilde. Contrary to apostrophized, the orsicus can meet on an isolated syllable.

As a note indicating a sequence, the oriscus plays a part similar to that of the Quilisma.

The most frequent example in the Gregorian repertory is the final standard formula opposite, including/understanding a oriscus between two Torculus.

Execution in rhythmic sequence

To obtain an execution " fluide" , a rhythmic legato, it is better to interpret it like a note of restarting :

the neume which precedes it (even the preceding incidental clause) is slowed down gradually, as if it were necessary to prepare with a stop (final rate/rhythm) on the last note of the first neume; all occurs as if the oriscus were replaced by the two bars of end of part.
the oriscus awakes the general deceleration, while starting on the last note of the group without him to leave the duration which would have been natural for a final. It is a note of attack, and a recovery with against time, but not accentuated (that it is in force or duration). Being in unison, its rhythmic execution is similar to that of a Pressus.
This alarm clock starts again the rate/rhythm, and allows the additional addition of one or several neumes.

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