The appropriate term has changed quite often over the years..
Box-mag or Mags are appropriate to these...
Clips is a term that is only appropriate to rifles using this system...
Do not forget that a Tubular Magazine (such as found on the Marlin 60 & lever-action rifles, is also known as a Mag/Magazine.
Most folks call 'em "Tube Mags".
Also, Calico firearms have Helical Mags...holding 50 or 100 rounds each. A superior system indeed
Calico Liberty III's