"A variation of the neck-less amphora, characterized by a continuous curve from lip to foot.
Shape: The shape is similar to Type B , but with a convex (rolled) lip, and either a torus or an inverted echinus foot.
History: This form is especially popular in the third quarter of the sixth century with the black-figure painter known as the Affecter, who also paints neck amphorae. The shape continues in red-figure pottery from about 520 to 450 B.C. In black-figure the decoration is confined to the two panels which appear on the front and the reverse of the vessel. Sometimes the zone above the foot-disc is reserved and contains a band of upright rays. In red-figure, the panel is abandoned in favour of a figure placed in silhouette against the black ground of the body of the vessel."
http:www.perseus.tufts.eduhoppertext?doc=Perseus:text:1999.04.0004:id=type-c-amphora (en)