FIG. 1 is a perspective view of a trephine in accordance with the present invention;

FIG. 2 is a side elevation of the trephine of FIG. 1;

FIG. 3 is a top elevation of the trephine of FIG. 1;

FIG. 4 is a right elevation of the trephine of FIG. 1;

FIG. 5 is a bottom elevation of the trephine of FIG. 1;

FIG. 6 is a front view of the trephine of FIG. 1; and,

FIG. 7 is a rear view of the trephine of FIG. 1.

The broken lines in FIGS. 1, 2, 3, 4, 5, 6 and 7 are for illustrative purposes only and form no part of the claimed design.