Caecum Gulosum, sp. nov.
(Fig. 16).

Shell white, slender, rather curved, suddenly expanded behind the aperture, concentrically sculptured by fine close threads which grow coarser anteriorly. Septum much exserted, flattened distally and with two rough ring ridges. Length 1·8, breadth •4 mm.

One specimen from the lagoon beach.

Nearest to C. attenuatum which is narrower and more curved, also allied to G. amputatum, Hedley,^* from which it differs by being smaller and of a more Fi. 16 slender build.

Fig. 16.