Dicharax (?) umbonalis (Benson, 1856)
Alycaeus umbonalis Benson, 1856: 225-226.
Alycaeus umbonalis - Reeve 1878: pl. 4, species 36; Godwin-Austen 1886: 194-195, pl. 44, figs 2, 2a-c; Godwin-Austen 1914: 413, 424.
Alycaeus (Chamalycaeus) umbonalis - Kobelt 1902: 364; Gude 1921: 235-236.
Type locality.
"ad Akaouktong, prope ripas fluvii Irawadi".
Material examined.
Burmah, UMZC I.103005 (3 syntypes); Akoutong, Burma, Blanford coll., NHMUK (5 shells).
Remarks.
Protoconch low, no spiral lines visible; R1 with rather regular ribs and without spiral striation; R2 long, with widely spaced, ribs lamella-like, straight, but relatively low (typical Chamalycaeus character).