We claim the ornamental design for a cereal bowl, as shown and described.
FIG. 1 is a top perspective view of a cereal bowl, showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a right-side elevational view thereof, the left-side elevational view being a mirror image thereof;
FIG. 7 is a bottom perspective view thereof; and,
FIG. 8 is a cross-sectional view thereof, taken along line 8-8 of FIG. 2.
The broken lines showing text in FIGS. 1 and 2 and additional stacked cereal bowls in FIGS. 1 and 8 depict environmental matter and form no part of the claimed design.