Evolution of the cochlea about 7 mm long. Like in lepidosaurs and archosaurs, it contains a lagena, a vestibular sensory epithelium, at its tip. Only in therian mammals (marsupials and placentals) is the cochlea truly coiled 1.5 to 3.5 times. Whereas in monotremes there are many rows of both inner and outer hair cells in the organ of Corti, in therian (marsupial and placental) mammals the number of inner hair-cell rows is one, and there are generally only three rows of outer hair cells. Amphibians have unique inner ear structures. There are two sensory papillae involved in hearing, the basilar (higher frequency) and amphibian
Stirrup jar jar offers two basic zones for decoration, the body and the shoulder. These are defined by concentric bands of color around the bottom and the top of the vase. The bands are present on nearly every stirrup jar, whether the canvases are painted or not. Sometimes the bands cover the entire body, and are the only decoration. The colors, generally red or brown on a cream or buff slip, are produced by hematitic inclusions in the paint. Evidence of the Linear B documents indicates that Stirrup jars were used as containers for olive oil. Speculations as to other content have