The Quarter-Siliqua denomination
Siliqua is the modern name given (without any ancient evidence) to small, thin, Roman silver coins produced in the 4th century A.D. and later.

Correspondingly, the quarter-siliqua is a coin weighing quarter of what the siliqua weighed.

When the coins were in circulation, the Latin word siliqua was a unit of weight defined as one twenty-fourth of the weight of a Roman solidus.
Quarter-Siliqua
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An AR Quarter-Siliqua struck 610-641 in Ravenna
Obverse: Diademed and draped bust right Text DN ERACLIVS PP AV

Reverse: Cross potent within wreath

Diameter: 6.37 mm
Die Orientation: 0 H
Weight: 0.6 g
No notes for this coin
DOC 281; MIB 156; SB 907
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An AR Quarter-Siliqua struck an unknown year in Ravenna
Obverse: DN HERACLIVS PP AV, pearl diademed, draped, cuirassed bust right

Reverse: Cross within raised border or wreath

Diameter: 10 mm
Die Orientation: 0 H
Weight: 0.3 g
No notes for this coin
SB 907, DOC 281, DOC 281
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An AR 120 nummi | Quarter-Siliqua struck 610-641 in Ravenna
Obverse: D N HERA[CL]IVS P P AV Diademed and draped bust of Heraclius to right

Reverse: Cross potent within wreath

Diameter: 14 mm
Die Orientation: 6 H
Weight: 0.4 g
No notes for this coin
DOC 281. MIB 156. SB 907.
(4) Ostrogoths | Theodoric | Anastasius I
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An AR Quarter-Siliqua struck 493-518 AD in Ravenna
Obverse: pearl-didemed bust right, Ostrogothic-style garment; D N ANASTASIVS

Reverse: monogram of Theodoric - (THRD) S / O; INVIC_TA ROMA / *

Diameter: 8.5 mm
Die Orientation: -
Weight: 0.5 g
in the name of Anastasius Ravenna or Rome
WARWICK WROTH No.:78 plate vii.9