Work found, with species-group names introduced therein:
Sowerby, G. B., II. 1849a. Descriptions of some new species of Ovulum in the collection of Mr. Cuming. Proceedings of the Zoological Society of London 16 135-136. [Stated date: post Nov 28; true date: 25 Apr 1849.] Ovulum uniplicatum, see Simnialena uniplicata (Sowerby II, 1849)