The ornamental design for a biological sampleholder, as shown and described.
FIG. 1 is a perspective view of the sample holder showing our new design.
FIG. 2 is a top view of the sample holder of FIG. 1
FIG. 3 is a front view of the sample holder of FIG. 1.
FIG. 4 is a rear view of the sample holder of FIG. 1.
FIG. 5 is a left side view of the sample holder of FIG. 1.
FIG. 6 is a right side view of the sample holder of FIG. 1; and,
FIG. 7 is an underside view of the sample holder of FIG. 1.
The broken lines are included for the purpose of illustrating unclaimed portions of the biological sample holder and form no part of the claimed design.