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Long. 30, Diam. 15, Apert. 7 mill. This, the giant of its genus, is perhaps the most remarkable land-shell discovered during the voyage. It differs from all other Pupinae in having an unpolished surface. It was found in the South-East Island of the Louisiade Archipelago, under dead leaves chiefly about the roots of trees. Pupina thomsoni. Tab. 3 fig. 2. a, b.

This remarkable and beautiful little Pupina is most nearly allied to the P. bilinguis of Cape York. The curious manner in which the margins of the canals are prolonged on the back of the body whorl like parallel and somewhat diverging walls is also a singular feature of this species, which is dedicated to Dr. Thomson, surgeon of the Rattlesnake, and an excellent botanist.

This very remarkable shell, the first of its genus discovered in Australia, differs from all its congeners. It has exactly the aspect of a Clausilia, but the mouth is not furnished with a clausium. It was found under stones at Port Molle. Pupina grandis. Tab. 2 fig. 10. a, b, c, d.