Sowerby, G. B. I. (1846). Monographs of the genera
Orbicula, Crania, Hipponyx and
Thecidium. In G. B. Sowerby II (ed.),
Thesaurus conchyliorum, or monographs of genera of shells. Vol., 1 (7): 365-371, pl. 73. London, privately published. [27 Nov 1846].