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Operculum none ? Animal unknown, but certainly floating, and probably pteropodous. This I infer from its habits, and from the analogy of the shell with Spirialis. It is translucent and of a brownish-white hue. Its aspect is that of a Turbo in miniature.
We might expect also to find a mixture of the remains of pelagic and littoral animals in the strata formed in the lagoon, for pumice and the seeds of plants are floated from distant countries into the lagoons of many atolls: on the outer coast of Keeling atoll, near the mouth of the lagoon, the case of a pelagic Pteropodous animal was brought up on the arming of the sounding lead.
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