Borsonia zelandica

Borsonia zelandica is an extinct species of sea snail, a marine gastropod mollusk in the family Borsoniidae.

Description
The spiral ornament consists of four wavy cords between the keel and the lower suture. The suture is margined by a stout swelling. There are 6 to 7 axials per whorl with wider interstices.

Distribution
This extinct marine species was endemic to New Zealand