Scala Revoluta, Sp. nov.
(Fig. 7).

Shell minute, white, with smooth coiled apex and variced, solute, subsequent whorls. Whorls six, of which the apical three are smooth and in contact, the fourth commences to uncoil and the remainder are widely separate. Varices eight on the last whorl, with an anterior corner, slightly elevated; between the varices the shell is smooth and glossy. Aperture broken in the type example, but apparently circular. Length 3, breadth 1·5 mm.

Fig. 7.

One specimen from the lagoon beach. The only shell for which the novelty might be mistaken is S. hyalina, Sowerby. Judging from Sowerby's drawing^§ that differs by being much larger, broader, uncoiled to the tip, though less apart latterly, and by more numerous and serrate varices.