Dioryx distortus (Haines, 1855)
Cyclostoma distortum Haines, 1855: 158, pl. 5, figs 5-8.
Alycaeus distortus - Reeve 1878: pl. 3, species 24.
Dioryx distortus - Kobelt and Möllendorff 1897: 146; Kobelt 1902: 337.
Type locality.
“Siam” .
Material examined.
Siam: coll. Haines, AMNH 62467 (1 syntype).
Remarks.
Protoconch matte, without spiral striation; the overall sculpture very weak; first whorl of R1 with spiral striation and widely spaced, irregular radial lines; later spiral lines disappear and radial lines become regular and dense; R2 very long, reaches ca. 150°, it is entirely smooth, only slimmer light and thicker darker stripes alternate.