Eurybasis lychnia (Benson, 1852)
“This pretty species, remarkable among the depressed conic forms for its imperforate base and closely wound spire, was found by Dr. J. F. Bacon at Sincapore, where it does not appear to be scarce. A small specimen of H. janus, Chemnitz, accompanied H. lychnia from the same locality, to which it had not previously been assigned, the recorded habitat being Mount Ophir, near Malacca.” (Benson, 1852)
Benson (1852) original descriptions on Helix lychnia – “Testa imperforata, valde depresso-conica, tenui, translucente, polita, fusca; spira conica, obtusiuscula, suturis marginatis. Anfractibus 6½ angustis, planiusculis, ultimo vix latiori, ad periphaeriam acute compresso-carinato, subtus convexiusculo, medio excavato; apertura vix obliqua, angusta, securiformi, peristomate simplici acuto, margine inferiori arcuato, versus periomphalum leviter incrassato.”
Martens (1867) descriptions on Helix lychnia – “Testa imperforata, carinata, depresse conica, basi convexa, leviter striatula, nitida, virescentifusca, concolor: spira conica, obtusiuscula, sutura cingulata; anfr. 6½, planiusculi, lente crescentes, ultimus carina duplicata, basi sat couvexus, regione umbilicali leviter excavata, antice haud descendens; apertura subverticalis, anguste securiformis; peristoma rectum, acutum, margine basali arcuato, sigmoideo, columellari leviter incrassato.”
Laidlaw (1933) descriptions on Eurybasis lychnia – “Whorls about 6½. The carina is distinctly double, the upper thread of the two which form the keel is distinctly less produced than the lower.”
Helix lychnia – “Diam. major vix 12, minor 11, axis 5½ mill.” (Benson, 1852); Helix lychnia – “Diam. maj. 11, min. 10, alt. 6; apert. long. 5 ½, lat. 3 ½ mill.” (Martens, 1867); Eurybasis lychnia - “Diam max. 13 mm. Alt. 7 mm” (Laidlaw, 1933)
Type locality – “Insula Sincapore” leg. J. F. Bacon (Benson, 1852)
Other localities – “Singapore: Bukit-tima” (Martens, 1867); “Mount Ophir, near Malacca” (Benson, 1852); “Malay Peninsula; Gunong Pulai, Johore” (Laidlaw, 1933)