« The shells in general resemble those of the Antalinae, but as they appear usually to inhabit deep waters they always consist of a thin substance; the posterior end is generally less pointed and more widely opened than in the previous subfamily. » – F. Stoliczka in Blanford & Stoliczka: “Cretaceous fauna of southern India”, Memoirs of the Geological Survey of India. Palaeontologia Indica vol.II, Calcutta 1868, p.440.
 

Synonym Helonyx Stimpson, 1865, who writes: « Shell small, subulate, polished, almost hyaline, arcuated, swollen before the middle, and contracted at the mouth; posteriorly attenuated, with the margin of the anal aperture entire. » – W. Stimpson: “On certain genera and families of zoophagous gasteropods”, American Journal of Conchology vol.I, Philadelphia 1865, p.63.
 

Shell minute, smooth with thin growth-marks, slender; anterior part with two marked slits (the word σχιδ meaning “slit”).