It is noteworthy that these yotl are found figured in the picture-writings representing the various objects which the Aztecs used to pay as tribute to their sovereigns. The collection of Mexican antiquities in the British museum contains a cluster of yotl-bells. Being nearly round, they closely resemble the Schellen which the Germans are in the habit of affixing to their horses, particularly in the winter when they are driving their noiseless sledges.