FIG. 1 is a perspective view of a first embodiment of a sink basin showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a right elevational view thereof;
FIG. 6 is a front elevational view thereof;
FIG. 7 is a rear elevational view thereof;
FIG. 8 is a perspective view of a second embodiment of a sink basin showing my new design;
FIG. 9 is a top view of the embodiment of FIG. 8;
FIG. 10 is a bottom view of the embodiment of FIG. 8;
FIG. 11 is a left elevational view thereof;
FIG. 12 is a right elevational view thereof;
FIG. 13 is a front elevational view thereof; and,
FIG. 14 is a rear elevational view thereof.
In the embodiment of FIGS. 1-7, the broken lines showing plumbing openings and the bottom side are for illustrative purposes only and form no part of the claimed design, and, in the embodiment of FIGS. 8-14, the broken lines showing a sill, plumbing openings, and the bottom side are for illustrative purposes only and form no part of the claimed design.