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 termed "unpainted" although in fact the viewer sees the first coat. It is not the color unpainted fired terra cotta would have; that would be variegated most likely ranging from red to black depending on the firing parameters and content of the clay. For example, Black Glazed Ware features a single coat of black glaze. Red-figure vases are washed with a black slip on which red figures are painted; black-figure vases, a red wash with black figures. Stirrup jars do not bear human figures; nevertheless, some are quite ornamental, with most of the painting surfaces filled with motifs. The stirrup