Antiplanes amycus Dall, 1919 Leucosyrinx kantori is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

(Original description) The white shell is covered with a brownish olive periostracum.

The suture is distinct with a wide rounded ridge in front of it, forming the posterior boundary of the anal fasciole.

On the upper spire, there are about 15 very oblique, anteriorly protracted riblets, chiefly visible at the shoulder and obsolete on or entirely absent from the last two whorls.

The anal sulcus is wide, deep, and rounded; the fasciole slightly impressed.