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The baskets were baited with mussels or frogs, both of which had great attractions for the Purpurae, and were seized and devoured with avidity. At the upper end of the rope was attached to a large piece of cork, which, even when the baskets were full, could not be drawn under water.
It was necessary that the vessel in which this final process took place should be of lead, and not of bronze or iron, since those metals gave the dye a disagreeable tinge. The colouring matter contained in the sac of the Purpurae is a liquid of a creamy consistency, and of a yellowish-white hue.
Pyramidella auriscati is a littoral shell among the reefs of the Claremont Isles. Several Purpurae were taken on reefs and rocks at low-water; among them was P. textiliosa, a Port Dalrymple species. A Quoya lives on rocks being high-water mark in Lizard Island. Several Terebrae, including T. crenulata dimidiata and affinis, inhabit muddy sand among Pipon's Islets.
This plan was pursued more especially with the larger species of Purpurae, where the sac attained a certain size; while with a smaller kinds a different method was followed.
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