Stomacosmethis perakensis (Crosse, 1879)
Alycaeus perakensis Crosse, 1879: 206-208, pl. 12, fig. 7.
Alycaeus (Orthalycaeus) perakensis - Möllendorff 1891: 342.
Alycaeus (Alycaeus) perakensis - Kobelt 1902: 348.
Alycaeus perakensis - Tielecke 1940: 345; Foon and Liew 2017: 56-59, figs 7S, 24, 31V.
Type locality.
"Buket Pondong, Perak".
Material examined.
Perak, Buket Pondong, MNHN-IM-2000-31793 (5 syntypes); Perak, NHMW 41007 (3 shells).
Remarks.
Protoconch glossy, without spiral lines; R1 with irregular, rather low ribs and very weak spiral striation in-between, but at the end of the region the ribs are more elevated, sharp; R2 very short, with alternating darker/thicker and lighter/narrower stripes which are somewhat elevated from the surface.
Stomacosmethis roebeleni may be a subspecies of A. perakensis although we refrain from treating it as such without further evaluation.