The two sheets are slightly bent with 6 strands forming the concave side and 5 strands forming the convex side.
12.
The rhachidian tooth has a subquadrate body with winged sides and a long triangular cusp with convex sides, which are serrated.
13.
The painted ware bowls, concave and convex sided, could have served as the table ware and the spouted ones for drinking water.
14.
Cameral depostis are well developed on the convex side, toward the apex while only thin on the concave side, making the curvature exogastric.
15.
The shell up to 18.9 mm in height, two times as long as wide, narrowly perforate, elongate, with hardly convex sides and fragile.
16.
In fortunetelling, four shagai are rolled on the ground; the two convex sides, horse and sheep, are considered lucky, with horse being the luckiest.
17.
The height of the shell is up to 38.1 mm, 1.71 times as long as wide, deeply perforated, conical, with slightly convex sides and solid.
18.
The " stovepipe hat " was a variety with mostly straight sides, while one with slightly convex sides was called the " chimney pot ".
19.
The siphuncle is close to the venter, which is the externally convex side of the shell, and is composed of very short, broadly rounded segments.
20.
The rhachidian tooth of the radula has an oblong shape, with convex sides towards the middle, and concave towards the top, with a slightly reflected margin.
