This float being curved round like the tail of an animal, the whole thing bore the appearance of being a sort of snake, of which the shell was the head; the sailors called them caterpillars before I had examined them.

The float was composed of two parts, one of which was only froth and the other was apparently some extraneous substance attached to the froth.

The shell is very different from those of the other nautili in being much more deeply indented with circular striae.
July 18.

South latitude 19 degrees 49 minutes; west longitude 3 degrees 10 minutes 15 seconds.
We have lately caught several specimens of Creseis.

Each consists of a cylindrical tube, increasing in size from its broadest extremity to the centre where it is thickest, and decreasing from the centre to its other extremity, where it becomes a fine point.