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.
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.

(1)
Heraclius

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
Die Orientation: 0 H
Weight: 0.6 g
No notes for this coin
DOC 281; MIB 156; SB 907
(2)
Heraclius

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
Die Orientation: 0 H
Weight: 0.3 g
No notes for this coin
SB 907, DOC 281, DOC 281
(3)
Heraclius

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
Die Orientation: 6 H
Weight: 0.4 g
No notes for this coin
DOC 281. MIB 156. SB 907.

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