The ornamental design for a teatcupliner, as shown and described.
FIG. 1 is a top perspective view of a teat cup liner showing the new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a side elevation view thereof showing the location of the cross section of FIG. 9;
FIG. 4 is an opposite side view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a cross sectional view thereof at the location indicated in FIG. 3.
The structural features depicted by broken lines in the drawing figures have been shown for the purpose of illustrating portions of the teat cup liner that form no part of the claimed design.