We claim the ornamental design for a flowcell cartridge, as shown and described.
FIG. 1 is a top view of a flowcell cartridge.
FIG. 2 is a bottom view of the flowcell cartridge.
FIG. 3 is a left side view of the flowcell cartridge.
FIG. 4 is a right side view of the flowcell cartridge.
FIG. 5 is a front view of the flowcell cartridge.
FIG. 6 is a rear view of the flowcell cartridge.
FIG. 7 is an isometric view of the flowcell cartridge; and,
FIG. 8 is an isometric view of the bottom of the flowcell cartridge.
The dash-dot-dash lines represent the bounds of the claim; the regular dash-dash lines depicting the rectangular panel illustrate unclaimed subject matter; and all other broken lines represent environmental subject matter. None of the broken lines form part of the claimed design.