Fig. 467.—Form derived from a wooden tray.
Fig. 468.—Form derived from a horn spoon.
Fig. 469.—Form derived from a bark vessel.
The carapace of some species of turtles, and perhaps even the hard case of the armadillo, could be utilized in a similar way. The shaping of a knot of wood often gives rise to a dipper-shaped vessel, such as may be found in use by many tribes, and is as likely an original for the dipper form in clay as is the gourd or the conch shell; the familiar horn vessel of the western tribes, Fig. 468, a, would have served equally well. The specimen given in b is from Arkansas. As a rule, however, such vessels cannot be traced to their originals, since by copying and recopying they have varied from the parent form, tending always toward uniform conventional shapes.