Some of the sepulchers found in Yucatan are very similar to the jar tombs common at Mugheir. These consist of two large open-mouthed jars, united with bitumen after the body has been deposited in them, with the usual accompaniments of dishes, vases and ornaments, having an air hole bored at one extremity. Those found at Progreso were stone urns about three feet square, cemented in pairs, mouth to mouth, and having also an air hole bored in the bottom. Extensive mounds, made artificially of a vast number of coffins, arranged side by side, divided by thin walls of masonry crossing each other at right angles, to separate the coffins, have been found in the lower plains of Chaldea—such as exist along the coast of Peru, and in Yucatan. At Izamal many human remains, contained in urns, have been found in the mounds.