The ornamental design for a jugulartourniquet, as shown and described.
FIG. 1 is a front perspective view of a jugular tourniquet;
FIG. 2 is a front view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof; and,
FIG. 5 is a side view thereof.
The broken lines in the drawings are included for the purpose of illustrating portions of the jugular tourniquet and form no part of the claimed design.