Type locality: Lavanona, southern Madagascar. Range: Androka and its vicinity, southwest coast of Madagascar. Habitat: Moderately shallow water, on the subtidal zone.

Description: Shell is small and elongate ovate, thick and solid, measuring between 35 and 40 mm long. Spire is short forming less than one third of the total length. Protoconch is brown-purple coloured, large for the shell size with an average diameter of 3 mm. Teleoconch is of 4.5 flattened whorl. Sculpture is of very few, faint axial ribs on the first postnuclear whorl, it rapidly becoming obsolete. Body whorl smooth and shiny with only 7-9 hardly visible spiral grooves towards the siphonal notch. Suture deep, almost channeled. Outer lip is thickened, flared at its lower half forming a defined channel at the posterior end of the aperture. Parietal callus thick for the genus with a lateral free edge. Columella calloused bears three strong anterior plaits following adapically by 3-4 thin plicae.
Background colour varies from grey beige to chocolate. Pattern of three spiral bands of interrupted black blotches, posteriorly mirrored by cream marks forming in some specimens a continuous spiral bands, overlaid on the body whorl by very faint spiral brown lines more conspicuous on the thickening of the peristome. Animal: Not available for study.

Discussion: L. (I.) pauljohnsoni can be compared only with its relative L. (L) brianoi.
It differs from L. (I.) brianoi by the deeper and longer posterior notch, the chanelled suture, the absence of axial ribs. Colouration is different, not orange brown as in L. (I.) brianoi.
Remarks: This shallow water species remains rare because of the remoteness of its area of origin, hard to reach through a roadless country. It is sympatric with the westernmost distribution of L. (I.) patbaili. Gem specimens are scarce, most of them bearing repair scars.