anterior notch

The shell does not have an anterior notch.

The eyes are oval in shape with a deep anterior notch in the orbit.

These may be continuous with each other, or may be divided below by an anterior notch.

The anal notch is shallow, and the anterior notch is well developed.

The anal siphon occupies the anterior notch or perforated summit of the shell.

The anal notch is shallow to relatively deep, and an anterior notch is absent.

Harpago chiragra has a very thick, robust and heavy shell, with a distinct anterior notch.

The anterior notch may be absent to moderate in depth, and the shell has a moderate to shallow anal notch.