Sinezona ferriezi (Crosse, 1867)

Original description: Crosse, 1867. p. 318, pl. XI, f. 7, (Schismope). Noumea, New Caledonia

Diagnosis: A thin shell, with a flat apex. The selenizone is placed well above the widest point of the shell. There is a concave area below; the umbilicus is wide and open. The sculpture of axial ribs tends to fade on thelast whorl. There is very little sculpture above the selenizone., exept for the fine spiral threads that cover the entire shell.

Size: 2 mm

Range: Qld., New Caledonia, Indonesia; beach to 30 m.

Remarks: In its immature stage, when the selenizone hasn't closed up, this shell can resemble Scissurella coronata and S. declinans. S. coronata has much stronger sculpture, especially on the last whorl, and does not have such a flat apex. S. declinans has very strong axial ribs on earlier whorls, and has a much more rounded shell, and less prominent selenizone.