1836  Goniatites calyx Phillips: 236, pl.20 fig.22,23.
     1849  Goniatites calyx.-Brown: 30, pl.21 fig.60, 61.
     1897  Glyphioceras calyx.-Foord & Crick: 206.
     1949  Homoceras calyx.-Moore: 395.
     1972  Homoceras calyx.-Ramsbottom: 161. [Species not recognizable, type lost, lectotypes incertain].
     2008  Homoceras calyx.-Nikolaeva: 56, pl.11 fig.7-10; pl.15 fig.4.

Type material: Lectotype and Paralectotypes desginated by Bisat & Hudson, 1943, p.405, BMNH C252a.