Zonitoides cookei Pilsbry, 1922 Microphysula cookei, common name the Vancouver snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Thysanophoridae.

[1] Pilsbry's original text (the type description) reads as follows: Zonitoides cookei n. sp.

The shell is discoidal, the spire very slightly convex, umbilicus regularly diminishing inward, very nearly one-fourth the diameter of the shell; whitish, glossy, smoothish, under the microscope showing faint growth lines and on the upper surface an excessively minute, close and shallow spiral striation on the last 2 or 3 whorls.

This species is distinguished by its very low spire of narrowly coiled whorls, and especially by the narrow aperture.

The generic reference is uncertain, as we do not know whether it possesses the Vitrea or the Zonitoides type of teeth, and the shell characters are not decisive.