Note 27 — INTRODUCTION.
Reading edition
A smaller variety of this instrument was called tlapanhuehuetl, or the half drum, which was of the same diameter but only half the height.27 Still another variety was the yopihuehuetl, "the drum which tears out the heart,"28 so called either by reason of its penetrating and powerful sound, or because it was employed at the Yopico, where that form of human sacrifice was conducted.