1944  Eumorphoceras bisulcatum mut. grassingtonensis Dunhan & Stubblefield: 258, pl.11 fig.4a-c.
     1961  Eumorphoceras bisulcatum grassingtonense.-Bouckaert: fig.1.
     1962  Eumorphoceras bisulcatum grassingtonense.-Yates: 381, pl.52 fig.3,4.
     1963  Eumorphoceras bisulcatum grassingtonense.-Bouckaert & Higgins, p.114, pl.2, fig.1,2.

Holotype:  KD.423